complete advanced level mathematics - pure mathematics
DESCRIPTION
My personal copy of this book. It as its uses now and then.TRANSCRIPT
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5.1 Finding the Gradient of
a Curve[ lie jmilii-m ill .Mdi poiul oil ill.- ja.ipli i>l lL linrar iunction, such us
Jp- 2x +1. is conslonl. However, mnnv mnlheraalical funclions are iImear, and have crved ' uphs wj.n U : a,.- ccUinuouslychausLnK.
Lcink al the graph of y = Notice lhal lhe Brndienl changes from being
negative lo posilive ni (he griiph er.w-ies itin r-a<is. II .ds.i becomes sleeperfor larger posilive and negative values olx.
. .Illlleli,,!!
point Lool
ing theBradienl of lhe curve is ool as Straightforward as il is lot lhelinear hmclion. The gredienl of lhe curved graph al any particular point
indbvcakuilaliiiiitliejinulmiil nl tin; iLinKeni u, Hie curve al this,kallbeKrapb0fy = x!9gaininmored
llr vMimnll.l lliillll1.|ii.inlS,( = -3,
Notice lhal tors > U. Hip (iradimil Is pwilivp and increases as lhelangenls become sleeper. When x < 0. lhe gradtenl Is negative, and
191
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Complete Advancei) Level Uslherrstics: Pure
8.4 Convergence, Divergenceand Oscillation
CmnHer Ihe Inllmving setiuenms.
3.5,1,8,11 U?,...
1.2.
1,2.
1 v?....
U-U-A "n.-
As ;i increases, vihai happens lo ii?, va and tv??Notice tbBl the firsl secplence is an AP with a = 3 ami rf = Z, Thii nlh term,
u? = Zn +1. Asn gBls large |n - oo) un gels large (u? - oo). Thissequence is said to diverge.
Thn seonnrl seqm'nci' im|ily (i cill.Lli lieEtvenn l.ivhnnn is odd, and 2.
when jj is even. This siiiinciini is sjid In hv usedlalins A snijuenco lhatrepeats ilsrit in a regular paltern is periodic.Mm third si>i[ncnco is net an AP or CP. Check tliis liy li yiji; [n linri ,i
ion difference or common r.itLU. 'I'lm Mir|iimce has nlh Lenn
= jj , Asn gets large (n- x .t.,, gels small ln? - 01. This Verify lh is hyseqnei.[:e is said to converBe. Tim lenns of tin'wqunLi n lirl .:!omt nml
' nM ldiii rn-IIlcdoserloalimiluf/cm. s uence Inrnmd hyA m-.i[>lM i,ii l.ri.i id ;r>nd illLisirnti..11(11 lliHht'lMvirinri lliHsi'ti i- driiojiiin,Mors only.
as nine-eases,Willi i;
r,
lhallhislsan
n....a = 2andrJ = ;
The laloes giaw in sire as n inoeases.
The setjoence coniBigss to ahrn.j cass
. w.. - oasnmcrc
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Comoloto Atfrancod LbkoI MathicmaTigs: Pura Malhomatlcs
8.5 The Binomial Theoremand Power Series
What does 'hinnmlaT nieon? 'Bl' is LaUl lg double .SL liiimrainl is Unroll lumi ClupVT.rms. SoniK examples of liinomial! are (n + h)', lhat 'polynomiaV Is
Greek for 'many lernij;. i'\|Hi'-siim v.:Mi Ivvn I, mi. Senu- . x.mi].].v .,1 biiuimiiils a™ In
Thn lilnoriial (n + h): cm b>: roivrillriii as ,1 sura uf nlguliraic lerms.
(a-t-bl' D' + Zoin-y
Thera ore also dgrfiraic nspressions for binomials wilb powors sroalorIhan2
(o + ii),-o, + 3oIb4-3abI + ti1
( + b)' = (0 + 61(o + 6)3
= ( + fi|(D, + o' l + 3o ), + 6,)
- o(o3 + 3a'b + Jot1 + i'| + fila" + 3uJt + Sob' + b" |- uV So'b + So'b1 + ofi' + ba1 + SoV + Sab1 + b'
-o' + b + Bo'b' + + b'
Consider Ihe following SlniCtu™;
(a + b)1 =0 + 6
(o + b), = d, + anb + b'
(o + b)' = a' + ao'b t Sab" + fi1
(a + b)' = o' + 4oJb + So'b1 + 4ob3 + b'
Now wtllt down the coefficients o!
re ivril[cn dowIs I hey ,ui! hiach oiher.
mly oltbemb
[fie [enns in Ihcsc cxpaii' form uncle
2
1
4 1
Write down lha
by adding lha numbers direcily aboti.v iiilliislriansli;, Cbuck lhal oacli fiRuro iscroalod
in ii.
Urhebamtchtlcb oeschutzles Material
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Applications and ActivitiesLoan repaymentsThn sum of agBbmBlilc nrios can hs iifpil lo find:
. lbs limo laksn lo repay a loan Riven a debt, inlorest rale andrepaynieDLinstalmenls;
. the repayment ir«l in »l jjiv, a tl-H. inli resl rain and repaymonl
Yuuborm.V£:ira(lrfl I 4".. APR [i.iv i>,ir:k LMIH) vc.Lr. ilim APR is Iha Annual
il lakn In rppay Ihe debl? Percanttige Bate andraustby bw.to quoted
ml Id ropay Iho dcht in thnra years, on ell i:roriiiislalmenl bo?
[2| You borrow Eiona Bl 14M APR and WB1Whal should your raonlhly inslalmenl I
[3] InvosliBalperodiHormsfo,tables for Ihc (iiioiulI Ai'K.
mmpanios and chsck the r.paymnot
SummaryA scquener: is a sol of numbers
sequence are added loselher.a!ring in order. When Ihe Imis of ai is formed,
A sequence can be described using an algebraic (erm for u? or by aice relation.
A series can be ivrillen using sigma noloUon, which uses the GNefc letlet:U.ii,g sigma n,ionnveranumi
The nth term of an AP is where u Is the first lann. and d Is
the common dilferencE.
t he sum to n terms of an ariUimolic series can be written in cquivolenlforms
+ (n-lid
MBB .vhcra/is Ih. last term.
The nth Icrra eta GP is K"' where a is Ihe first term and r is Ihe
357
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-c :) Lv\c: M -. timcs: Pure Malhemalgcs
SummaryThi- ffl.;»jr fornnil.i.v In i.mvu.l .ii.jn ..ml ilill.ir m: of sitins ami
cosine inlojjtociucts, are:
ir)-( )TUB fundlon asin.v - bC06X can lie ojiiressed as:
flainlx +1) HsiDd - a) Bcm(x 4 I) flcostt - a)
. :. adJiigmUBlheappi ... gquallng coaffidentg Ip produce Wo «ir
. [.. [Mjiimi.ii lli-.i-n v;ilii.--!il -( .indfL (( iinrl Ki.njlxrl-nindl.v ll t.dingnsinB the appropflate compound angle fcrmuia, and Ihen
fives R = v +F and dividing Ihem gives an equationand adding Ihem gives R = vF+Fand dividin]lor tan 3.
TliiMmilnmineHufefuilbr
I. solving equations of the fonn ain* + b los* = c;
land minirniimvahiraijfiaMori.illiiiiclim.Mvilli
I. solvinKequationsoftl
2. finding raaximum and
Irlgnnnmeltir. dennminatnis;3
, analysing periodic motion.
Trisonometrlc equations of tho lonn;
sinH = t and cqsfl = jt, where-1 < it < land lann = t. vvhereit f a
can he solved to iv'bulli a |jriiu:i]iiil s-jkilinn and a generalprincipal solution ean he fmind using a ealr.ulntor. The genci
formula can then be used to senerale other valid solutioi"meral solution can hnvvr
J solution. The
ind solution
'rillen in both degree endRemember that tho geiradian form.
1. It cos 0 = k. then 0 m a&O'n ±aorfl=2iin±i.
2. If sin (I = I, then 0 = IBO'n + (-1 or 0 - ™ + (-1
3. If lan « = i then 0 = lBDJn + b or fl - m+a.
Urtiehafrnchllch BeschulzlBE Malarial
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11 Dilterentialion II
11.1 Differentiating Productsand Quotients
In ChapLer 5, Ihe tochmqiios ror difrcrcnLialinA polynomials, functionsinvolving nUanal povrara otx, and sino and cosine functions wendeveloped, Manv other mslh iiiilir.d hnw.Wnn* formed l.y muHiplying
or dividing two or mure of these types at funclions. Some of Ihosaproducts and quotients can be differentieted by Bral expressing thefunction as a polynomial, and [hen different iaiing term by (enn.
However, there ere umnv |ir.idu. 1- i,n:\i|ntHie.ils, such asy = (2x + 3](x - I)" and v - - '-l-. where it is either difficult orimpossible to express the overall function.Is to express tlthis type can be differentiated using twoWhldl are known as Ihe product and quo
u.uji iioluieniial. Functions of
standard results, oralgorilhms,
The product rule
Supposey = uMvl*) Is the product of two separate functions of*: aami v. Any small change, &, in [he value of I will give rise to
norrespnmling small changes, ,iu and Sv. in the valoes of fuacHoDJ u and Vrespectively. These in turn res.dl in a small change, 6y. in the value Of J-,such thai
- jr + faMi + iiij-uWvW
It is possible to rmvrile this expressinn for Sy In the form
Sy - u{x + li*)v(* + Sx) - ufct + itKO + *0i)u(x + Jx) ~ u Mif)
It follows then that
sy - wfr + - v )] + rtvOK* + W - mi
Difforentiatinji from firEl principles,
+ Sy =u(x + ,il)v(i + Jr)l9thevalue otlhe function
l..m'.p..MdmBiojr + to,
Adding the tor-n&f4-4(M«) andv(i)u(t + fit), Nolicsthai these terms uncel.
Urheborrechlilch geschutzli433
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Complclo Adranc Uathemailcs; Pure Malhemalles
Tlip produLl rul« lor ilil[Viv;:li,Ll in- [u.iiilidiis ol Uii! lonny = caiba slated as
Using Ihe ubbrevialions u' and r' for and respectively, Ihfi productrule is more commonly slalod as
If y ui- dion - u'
- i ii 4 Lanrn Ihis importani rcsull.
Example 1UsinR 1 he produci rule, differenliotey - {2x + 3Hk - I)5 wilb rcspocllo.v.
Sofution
Lety ov where u = (Z» + 3) and v = (» - 1)', Tben u' = z andv'-4(1-1)'.
.ing the produci mlo.
= 4(2.v + 3H.V-l) - Z(J-l),
= 2(.r-l)J(5.v-f5)
-lOlJf + Dfjf-l)'
An GdvanlQRO of the produci rule is lhal il is usually possible loRel al.iduriseii L:xpreiiiu]i [oi ;};. I bis is uiLi'li uliirlv uiofui when tryinR lolomle and detoiliini; Ibf [uluri; u( dj.y slatiunaty poblla.
Example 2Kiral ilifL.i-Lirlieiiiofliw nirvey = x' cos.\ whan ¥ = jr.
Solutiontely - where u = ji! and i- = coss. Then u' = Kand = - sins.
Using Ibe product mle,
1=
= >: l-iinxj + comta
-x'sin + Hcosx
= i(2cosi-ialni]
Rrimemljar in UI
chain rule Id Hi
usolhi
in.l.-'.
Fact0ti«theD»pre?
as much as possible.
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Whan j = k, [tie giailleni oflha curvey =
= -Zn
The quotient rule
Supposoy = is the quolienl of Iwp separate fvTliis can be rewrlltan as Ih? product of u ami J. si
In funnlinns of,«: u anil v,
(uch that
IMngihe pradud nib to difierBntiolej'= u J gives
Su ive have the qunlienl rule for ihrferenliating CuucUoOI ( Ihe fenn
r-M
H r~x-2
a Let)' = where u = 3*+landv=i-2. Then u' = 3 and v1
angles:
sinn = D.
This is more commonly wriiiGn as
11=5, .hen Ua,?,hi,i1?p?r,an,reS?ll.
ExamplesUse the quotient rale to diftorentiale the following functions with respect
lirr rlviif i I". Iiii:.ti---'435
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11 Dmerenlialion II
11.1 Differentiating Productsand Quotients
Exercise
Technique
[jj Use; Lhs product and quoliEnl mips m ditfcranlialc each of Iho follDwiiigvrtth respect to *-.
y = x{* + *)t e y =
b y = (4x +3) + 1)' f y-jJd y-x'slnUr h =
[2] Find Lh» gradlBnt of each of the fullnwing curves at the polntB inilicated:a y = 3*-4l!fll|5.15) d ytgs at [-Z, 2)b J-(x-3)()I + Z),aH-3.-B) b / (at-SjainxaKfx-al
Contextual
fflcd
[Tl Find Ihe equaLions nf Iha langent and the normal ta the CblW OSa I the points indicated:
a y = al (2, -4) b y = (* - z)(« + 4)s Bl (-3, -S)c y = x1coixal (B,-i«1) d j- jfL al (-1,1)
Urheborrechtlich BeschijWi437
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-
I D rcntiali n il
-
1,050 22 1.387 25
I I-' i.3siim
-''
Nolica (hot as fa - 0. tho factor convctgos Lo a bmlUng valuii. which19 ciilferonl for each value nf a. For example.
(2") s! 0.B931S x 2''
-(s'Ih i.ouaei x 3"
This suggnsls lhat Ihere is a value of a between 2 and 3 for which
iimfi fi) - 1. For this particular value of o. It follows that (0*1 = n'.
Use a calculator to complete the above table of values of for a =- 2.5,1.7 anr) J.B. By furlbnr Mai and improvement, find the value of o,
cornel lo three decimal places, for which Um( ) = 1.This value nfn is an irrational number. Its value is e = 2.718 281 a, cor
lo seven decimal places, it follows thai
TIlijimiMiiMliiLl lli.'i m.ilivi'Hhfcininm-'iitki! Iimiilira.)' = e' is
K) = e1 l*arn Ibis impuitant result.
Tile «|imlimlijl iLiiicli.i:: bi liic onlv uiiirlm:! Ili.il r.-n.iins unalteredKhan [lillmnlialed.
An alternative way of establishiiiH this result is to use the scries expansionole'inlmrluoccl in Chapter 7:
Urhcberrochlli.:!- 439
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Complele Advanced Level Malhemallcsr Pure Mathamalics
Diftmmlialing Ihi.'i intiniln powsr series term by Ik™,
It ™n alscj he m-n UmI III,. diTiv iv.: ..f.iiiv iLNLnilid lunctian of lb..
fomy = o" i>
ThiM nlim.Mh.il
ThUmean5tha,lin:{ ).lna.The dalB nils can bo used lo difrorenliate cxponeidial funclions of Lform y = e"". where/(x) id some function of i.Let y = e", where u =/(«), Then = b" and =/V)
Using Lhediainrule,
- /Wo""1 « Derivalivc ol Lhe power < origina! ciponon
E«ample1DiffpmnliKlfl each of tbe fnltowing wilh lapad In Jr:
b y = e -c y = 3v
Solution
a Lei r = c- where o = 3x + 1, Then = e" and = 3,
Using Ihe chain mle.
t-t't-B
u>:3
Ihhabw'aeftBdi oeschulzlBs Malari:
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Using the qiiotfenl rule,
d}' va' - uv'
llii' - (3x - 2il?- Iil -i
f.
Thiin u :'nndc Lei s = uv. whom u =
v' = jt = -3sLn3r.
Using the prodmnmh,.
-W" 3( + 2a,'cns3(
= aa(2co3 3(-3sin31)
Example 3a resuil of a slump in Ihe housing nuntat. a properly inlUally valued al
epreclales. [Is value I weeks blur ran be mndalladi Us vslue is CV and A is a consUnl lo he
delemiined. Exaclij one year laler, Ihe properly remains unsold and isvalued al only £50000.
a Find an expression Tor Jc.h Find Ihe markel value or Hie properly afler 2B weeks lo Ihe i
poundc Find on o n-.M,, iur Thiin lind i1l,i nil,, ill ivluiii llm [impiTlv.
value is riepredalinB al Ihe slot! and end nl thn year in Ihe neamsl po
when I = 32. V = 50000.
CoinimmbctDrof 1
tGDOOU m 1 hMuiiir,'dninid.ihis.b>'l' = iinnnnn" u-htireiis v.-ilui i.
pound.
Solution
a After one year.Substituting into ihe expression fur V gtves
50000 - BO OOOd"'
521: = Mi)
b When I = 20
= aooDDe)'1'®
Take logattthms oll«sides.
it a -0.0035;
a negative value Isictedfoc
nciation.
.-.in.lru I
rtqir... Mil
IWWbwWCWfctl aHtfWHIM Maleilal
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1- D. - r un II
Given Ihol V = m ul rc k - iliKji, .lifferei.liale V ivilhrespect to (.
Al the fllarl ol Iho Vfiar, ( - (J. Thr; riiln aUvhirh llu' mpnrtv's valun is
depreciating is found by pulling ( = 0 mlo this expression.Chock Ihal
pound, I hi: r.il(M>rd.i[lm:blimi £2ltl per wefil:CarryoulBsiniiNiriMliiLil.iiiiiM liv MilisiilLiling J = n2, Verify thai nfler
To lhe m
Carry ou
one year, the rala of deprecialion is C175 pur week
Logarithmic functions
To flifferenUaU Iho nalnral tugaiillunic tunctiony = \ax from firstprinciples, consider the sniidl diiin , .Si', in (he value of (his funclion thatresnlls m.in a siiiall .ili.mye,
™, in (lie value of*,
Since iy*ly + Sy]-y
= lnU + ax]-lnx,
whEiey + *K = ln(x +K+At, 11 follows lhal
,K) is the value ol the fmuilioTi i:orretp(iniliiiH
Unlorlonnldi Iheii. it .mhv ?! n n.lin,; ih.i Wm f term in
tills expression. An iilHirnalivii .ippn™:h mulsI lie iaki'n in order to find %.Kenall th.n (he natural logarithmic func
HponanUairuncllonj- B'.
Ifj' = Inxjhenjt e1,niffen-iKialiilsliiittl sides Willi respect loj',
function j' = Inx is the inverse oi (he
1= if
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11 DflcrentiaTion !l
Example 4Dirrsrcnliale Ihd follDWing with lespect IdJR
) = IcKx' + ai-Z)lK
" + 1)
Solution
c Loly-ui-, whore u = * and v lnx. Then u'= 1 ndtf'-j.
Usinn Ihc praducl nile. -11 + ™'
= ! + lnjc
U.lWlh.,.oB..l?l., 4-=- ['©-'H46--)
_
(l->LnY)
Useilln/d)]. .
IMJ>- log,. "bae U = («' + 1). Thin £ = .nd J; = 2..
Using Lhn chain mle, = <
(x" + l)lliM
44S
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Complele Advanced LombI Maine mates Pure Maihamaiics
11.2 Differentiation of
Exponentials andLogarithms
Exercise
Technique
[T] M U.tteachotthBfollo ngrtlhmpatp*;
b y = 8'' g y e- iiDX
d y~c"" i yfmv*
[2] D».™ii.[.,.ch.ril,.MI..in,»ilh?.?cl M. y=ln( ) f ,=lnlsmS) Q
. y-Nfl b r-sd y = La(4* + ll i y-lnfl+*) - In(t-i)II y = ln(x4+l) j y = lDB,0(3l[-4)
[31 ForaachofLhefoliowingcui fmdexpresslonslbr aDdg?il locat«amldM.TMiiHfllu'iii.Hin!"f;.ny5lalionaiy points,
r-RK+Dil' b
Contextual
[Tl Find Iho oqualions oFlhc tanRcnL nnd Lho doimal Lo Lhf, foLLowing cmvcsat the poinls indicalcd:
a }--ln(3l[ + l)ati = 1 b ) = So1"" nil = -1
c j- s'lnjBlj-a d 7 = (x + l)a"* at x = 2
[2] «,= populalio,,, P. of a now town dovdopmenl grows expononlially for[he lirit 25 years siidh llial P - 1000 + 200c0 ,J'
. where / is the number of
yeara since ilscstablishmenl.
a What is the Inlital population Dflhe town?h What Is its populallon afler 10 and 20 yean?c Find an expression fur Ihe rale at which the populalion Increases al
any lime L Use this lo ciilcuhiL llie rale nf ImTease after 10 and 20years
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Cal.uilalH, I,, Hi,, ii,Mr,..Hi m.-ndi. In.w li.nj; .ilin- ils i . ilklmi.inl il i-i
bQfore the ral., ol innrn;,.,, i,, ll?. I,,,,,,,].!!,., n:;,,:!,,:. [HP p.,,,,!,. pet
h Find express!Imrins after
[3] Aball-biiarinB is rBloasud from rest from [he surfaes Uf a large tank ofoUinlu which il drups. After I wconds it has reached a deplh deem I met res.whBr8c( = 61-4a-lsl + 4.
a Calculate the depth uf the hall-beflring tq the nearest mi Hi metre, after1
. 2 and 3 secundi.
xpressions for the velocity, v. and acceieration, o, of the hall-Kiiifiiniwii
Calcnlate Its velocity and acceleration afler 0.5 secondsExplain what happens to the acceleration and velocity as r becom
[4] Tha priCe £Pof a particular laptop compute (waDVS afto ItS reka.e isgiven bjF= 1100 + 31 - 30ln{( + 2),
a After how many weeks docs the price roach its lowosl value? What isthe minimurn price?
b How much is the laptop alter six months anil what is the rate atwhich P Is changing at this lime?
UrheharrechtHcb geschutzti447
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11 Dlttorentlalhon II
a Laty = lanu, ivhore u = 2x. Then J; = soc' u ami = 2.
Using Lhe thain ink. .
b Lai y = cot u, whore u = (x1 + 2). Than |j - -cosoc'u and = 3 .
Using the chain rule, £ = £x= -cosec'u x Ux1
= -ir'™«,(;rI + 2)
c Lei y = iif, where u = lanx. Then g = Bu! and = sac'j.
Using Ihechain rule, =Su'xsac
1!
= BtBn1)CHC
<>
Differentiating cosec and sec
The deriviilivus of the two nlhcr reciprocal IriBonomclric functions,
cosecK = and soci = , can aiso be found using the chain rala.
Let y = J. where v = siiu. Then = - anH =
Using the chain rule, % =
So -=-(cosecv) - -cuseuicuH l.' oii lliis m-mjII.
Now find the darivallvfl of sec*.
Lely = l.whEteu = coss.ThEn = - and -sini
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i: Ctlrrrr-r.u-mll
ExamplesFind Ihc derivolivos of «noh of Ou follo.vmg funtliona:
a y Zxteax b y = c™u c y = tanaxsecx
So/ul/on
a Lety - av.whaw v = 2x and v = tanx.Thon u' = 2and v' sec'x.
Using Ihe producl rule, = ui + m'= iiisecii + 2lani
b Loly -[fwhere u = cosocx and v = x. Then u' - -cosccscotK and
U5ineLhEqucliC,1(,U|C, -
c Lsty = uv, whero u = Ian3s and v = sbcj. Them/ - 3sec!;i(and
Using iheprnduelnUa, H + ra'= tan ax sac * tan x + 3 sec1
3s sacs
- 5ei:ji(tan3ji Ieuii + 3sh:' 3s)
It v -. sin '' x. then .v = sin v. iffiirrntinlingboth sides of this equation
Now, coff'y + ain'ysl
« aaV-l-ii"'/= 1-
That is. cosy - yTT?
4 Lsini this result.
Notice that only IheIiosilive molls taken.This Is becauseis Isbecai
-!<J-<!.Bfvln(
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11 DlflBrentlallon II
d Lelj' = Lan"' ir. ivheie u = s. Tlien a; = TTP and $ =
Example 5Usa thn ptoduci and qootleiil ruins to dlfierenliaM eacb of lha faUovrtug:
Muiliiilv l..i.dilrl boMum
by0,
SOfUttM
a Let J- = uv, where u -xandv- sin"' i. Than u' = I and v' = 7 p-
Using Lhe product rule ~ = +
b Letj' = ;. where u = lim-,x and = 1+x1. Than i/ jJ and
iog Ite qwttenl rule. | =
4S3
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Complota AOvangad Level Haihemalics: Puie Malheirallcs
11.3 Further TrigonometricDifferentiation
ExerciseTechnique
fTI Diffcrcnlialo each of the following with rospocL \ox: y = tan 7r
h y.= Mh yseecSrc y potlx1
!
d y cosec'Sx
2 ,with
be product and qu!respacl tax:
I Lll.I-ll.dillnrllli .:i?.|| ,,] li,r ..ivi
b y-Sxsecxd y=*JlBn-'*
Contextual
fT] Find the gradienl of tach of Bib following curvn al the pd idlcatedand the eiiualiuna of lbs langem ami ilia noimal at that point.
a y = tflnl5)flt(B, )b y-sin-Ml-JtlallM)
Hi.
a.
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11 DilfBienllatlon II
11.4 Using the SecondDerivative
Stationary points
Kncill IVi.ra CLiifUri i llml Hi..: li.-iwn jiuinK r i|ilican bo localcdhy iulvins llw nqunlion = I). Their milun: am Im lii'lnrrainsrl hy lonkingnt Llin K.mlrail nl Ih.: tmiih ra. nillvT ,1,1 of HMlimi y jioint. 11 isLiN.i iiiissililn lhn smirairl .hiriviilivn lii hiilji ilwikln whBlhsr apaftlcular sMIonary poini is a ina>imiim or a mfalnnmi point
Thr p tall gfi cmad graph is ilsulf a EudcUDB nix. Hy drawins Ihcgraph, ofy - fl.v) and ils gradiMl rmi. ti..!. V - "1 il * l ihle la relSfmlm tb PPW aa lhR IWHgraphs.
i ol Ibo fuoclion/HI = «' - Ir1 - ttj + 10
&< - g. Oack the luHurc ol the Mian
point. « yoa dniw Ifae Braph.. Check yo«f mtilU luinR . graphical
K.lr..x.tll|.|1!. .Ulr.hlh. graphs of tland il< derivative fui = Ur - 61 - 0. Check tho nalure ol the slalioaan-
draw the s.
IF.
:H7
i'
.CI-"
114
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Complele Aflvanced Level Mathematics: Pure Mathematics
Notice thalouliiim mumi iiuintou Itii'curvay s3 -Si'-Hs + lO,tho tunrlion rh.mRns from he.ng an inm inq fnnrlion of 1 to arim.iUrmrhanElKik-creMins liinclioii olx. fliis n jlivt;
'
c1ijli«i! in Hie gradieal. trumpositive thnmghroo toiiBgotlvo.onegativE, as Ihe curve passes [hmugh (-1,15).
IS thai Ihci Krarli1:nt<1f 111,: si-.iiHi-nl fl11;, .lirm. or stolid dcrivalivo. is
nosalivool Iho max i mum point.
SnaL lha maximum poinlon Iho curve. { |< 0.
n puinl. 'I '!, ' U 4 Rememher this importanl result.
At Ihe niiniimimpoinlonlhecurvBjr -S -Sx + lO. Ihe functionchanges frum bdnfl a dacroagiDg funcUon of < to an increasing fimcllon of«. Tha.v,Thnc0rres,>lmd,n11(:(U1,,1.mll,(.Fri,(l,™1 irorn native thrcush .ere
loposllivcaillnrctLnui " tiiroiiRh i3. 17:. ,lhi5 indicates that thoRradient of the gradient functini.', or second derivative, is positive at the
So at tho minimum point on tho curve, | ) > 0,
- - B 4 Remeintier this important nsnlL
Th.Tei-ial.WiLimiiLl (if intlejion al(l,-1) on thSiy = x3-3x
1-9x + 10. This is where the tangent to Iho
ftom one side to another. This Is not a itatlonaiy poinl. Instead It is Ihopoint at which the gradient of the curve is at Its most negative. TheSradient of Ihe gradienl functiuii'. or second derivative, is zeru at tills
point of inflexion,
In fact " = o al all points of infloiion. whether ibey are stationary or mII is possible, howaver, for tho second dnrivativo to equal znroat pointsthat ore not points of ioflesion. Consider the graph of y = x'. This has astationary puinl at x - u. Its second derivative - rjj<: equals nerowhom = 0. but this slationarj- point is dearly a minii
Check this with a
graphics! calculaloiCheck also tho srapy- -x*
. This Is a
whom = D.
TIum.iiK' l.:li.lt>l umi .itddrrniinin-III.: nalim-.,! ,i st.ilioiKirv poinl al
which = 0 is to look at Ihe gradienl. %. on oilher side of tho poinl.
Urheborrochllich aeschuteles Malarial
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Summary
. 35 = 0 and g;<Oal maximum poinls
. = 0 and > [) ril riiiniiinEni [ininls
. if g = 0 and g = 0, Ihe aign of IhoBradionl, £ on cither aide of Ihestationary point must then Lo found to dctermino its nature - do notiissuiiii! that it is a slaticmary paint uf inflaxion.
Example 1
,.
(.n(M.-m..liv.iv,:l,.(j,1,-1]:iill,Mh.>ir ll.ilmr.
|-inrl the CODrdilialOS nf Ihe stationary points on Ihe
fitetchtha cunra:
Solution
iv where n = (i + 3) and v = |i - z)4, Thon u" = I and
i - 2)J.
Using Ihe product rule, uv' + vu'= (i + 3)k4(i-2)1 + (i-2)*h1
-(X-2}J[4(»+31 + {J1-Z)|
= {X-1)3{SX + 10)
= 5(X + 2HX-Z)3
At slatloDoiy iKiints an Ihe curve. 3 = 0.
5{x + 2){x-2)'=0
VerifyThe st.
IJ111I u'tum.v -J.r .i .n.il rh.ii !,[,!.;,= -2,y = 25
i etaUansiy points are b ied at 1-2,256) and (;he detormtneri by evalnatms Ihe seeond derivative .
x = 2.yTheir nature
-2 and ( = 2
Use Ihe ptpduol rule aRain lo find i,Let = /J), whew / = + 2) and g =
II Mlmvs Ihal
= H-2)J.Then/ Sand
= VS$c+2)&-Z)'+S$-2)'-5[;<-Z)1|3(X + Z) + (t-2)]= 20(I-2)J(X+1)
Use Ihe chain rule to
iifforontiatolx-Sl'.
herai
irtghavebeen modeinsload ofnandv
to avoid confusion with
Ihe earlier working.
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Complale Advanced Level Malhetnatics: Pure Malhemato
When i = -2, - 20(-4]I(-ll = -320 < 0.So (-2,2561 Is a maximum potaL
When.-2. }-20(0)!(al-0,L. kins,,! l(>,.Mr,l,ii1:ril1>l llli:i:ll.'.i:iHinlh(!rsideofj( = 2:
. WhenX=l. = 5(3)(-l)3 = -15
. lv!ienl=S, = a(5](l)3=Z3
Thogradicnl changes from negative la posllivr: u theLhrmigh * = 2. so |2,0) is a minimam point.
This inr.irni.iliniiciii now l>i> ustii k.sk li III"
4 Chetklhisnsult usingWhlcalcdcBlRlDr.
Jhett thai Ihu eurvi
or touches U
M.i(-a,oj,ti, d,
and |D. 48),
General points ol inflexion
SiailDnary polnis of laBiixitm hove two fonns. The gradient oflhe Olfvecan be pnsiiive on both sides ol stationary point uf innexion nraegative on both sides, as shown in the diasrara. Check lhal a lanKent
irveal a slalionary polni of inflexlc .s [ninumfsiil,.
;
Hd.vevr'r -latimuiry |i(,inl-, ,.f i.illi-.l.m ?r.: S|i :,l t-.KW. The gradient oi acurve does not have to he zero al a palm of Infloxton, In fact, there musthe al least one non-stalicnary puinl of inflexion on any smoothcontinuous curve bGtivceu two stalicnarv points. This situ.ilinn can best
hedascribad Braphically.
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Complete AOvancea Level Malhemalks: Pui
a
D
The Rradlonl nachas ] nummum value ol point H. This means = 0,Since the BTfldicnl cl the sradicnl funntion is ckansing from pcsilive to
ncBnlivc as il passes Ihroush B. - r < 0 al B,
A-"
~
o
< o
Thegradienl of \\k ,:iirvf is ji live eillict siile ..fllu! poinl C, Its valueIs \mM negUlva (ilui is at Its nuudniuml at palot C. This means = 0 alIWS poinl. The gracile.,1 ef ll,e B.adienl funolion is changing hum positive
lu DBgBttvS, s" ihe diird derivaliveg; < D-
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11 Dlffarenliallon II
11.4 Using the SecondDerivative
Exercise
Technique
fl~| For each of Lhu folLoivintf cubic functions:i find expressions foi/-(X)andrWii find the coordinaics of anv slaUonaiy points on thf
and use Iho second dcrivalivo to dctcmiino thoir ni
IU 5ketchlhegraPhofc = /M,
a /(j)=i3-12xz+45k-4D
c f(x) = Zx1 - 9J[J - 108s +40
in thegmphofv /Winturc
[2\ Slalelhecnordmalasoftho
b Locate and det
r-tit-%c Find the c.
liinalns nftho points iv+ 3)3 crosses theses.
itermine tlie nature of tile stationary points on ihe curve Hint: Use the product- 5)(x+3)a. rule to diffonmiiaie.
zoordinaicis of the non-slaiioi
o. Use Iho first and third dorivatii
loniuvp inl,Kc OlliUr.T.
of inflexion on thisi llliiX its J1LIIILI;L.
[3l Locale and determine the nature of the maximum and minimum points onihe graph)' =x'- Zlx2 + 32. Show that there are two non-slaiionarypaints of infiexinn on this curve, at a = -o and x = a. whets o is a
ppsilivD intngsr to ba delarmined.
[4] a Find the coordinates of the stationary points on tho curve.
l'=I + 2cos« in the interval -is <I< In. Use the second
derivative to determine Iheir nature.
b Find the coordinates of the points of inflexion on the curve in thistlllll it
c Sketch y = x + 2 cosx for -2n < x < 2ji.
[S] Foreaehoflhefolbwinsenrve,:i write down Hie eoordinales of Ihe points where Ihe curve crosses Ihe
u : : i , alien of any vertical asymplnles
istureofany stationary pointsill Hnd an expression for iv locate and tietertnine the natl
Sketch Ihe curve.
a >-=*(*-!)'
b y = {x + *)'(x-2f
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need Lovol MaUiBrralics: Pure Malhamalics
[6] ForeachoflhefollowlnBcmres;i nndc<pr«S!i0nSforJDnd ;ii locale ami delmmm lii. a.,lu,r l.I.iiiv siofanyslaliona poinls,
b y = W* + 2) +
Contextual
2> + (((r0r-7.<x<
1
Tli.'lmi il l:wi<lj,-* Ijin.illiesrmLn-l-iti.iirlnr ifiiiiniiMiilH. slm.vnal,nve. can lie mccielled using /l = 5(l + 2}
Find BxpcwteufmgandSg).b Cultulalellie valiif ..f.v.H ivlii,;!, lliiri Mv i..,, ..f Hi,: rkli; is lL:i:l>esl.
and Ihe he
c Calculalei:
degne, 1, the track m iha ground al this poim
e heighl abnve [he ground ai Ihis pointale Ihis maxiraum gradient. At wbal anE!e. In the nearest: is the track In iha ground at Ihis poinl?
UrhetorrechIIich aoschutzlES Material
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II Dittoronlialwn II
11.5 Implicit DifferentiationAll.iflhK funcliunMliiil llnv.-hi-.:!. rlilfcisnlialHi a. far havebeen
oxprcssnl in Ihr tanaf -jix). Huwuver there are curves in Ihei-v plane,«illi Wiualiuns linking < v. Dial Lannm be writlen in Ihi,- way. Someexamples are drdi Mllli™--; .iihI lu pe.b,,! The e alions for Ihesa.:urv,s areealle,! Impllcll funcllons. The mrthed Hsad \<> fln.l Ihe t eli-nlat anv pninl cm I he lr curve* 1* callwl Implicil diiferenlialion.
For example, tlx CuMu aqiuUnDf a circle cif radiUM J, CMMd at lha
Rearranging Iheeriualirm,
Nolicn thai I wo eiplicll funclionsf = + 9 -I'andy - -V9-j[JarenDodGdlocomplnli'lyrlennothis circle. UsllinnRraphlcal
_
o
calculator, ploty - -t-v Fond
origin of
. ircle.
I M.llU-is 3.
The limtiai] nnulution
ijilailator mayreiull inloglopletely
the circle appeariih.vebeerrincom,
Both oflhawnpli ioeM an l>-dillerenlialad using the chain rut,Implicil dlHerenllatlrHl allom us In find an expression Id(£ fmm theoriginal equaltun.
iri-i.Tiiialinv.i' h n-rni ilHl.r i .piaiion v- + = 9 with rospec:! to I,
We know that £ <XJ| = K. and ft (fl) - 0.Use the chain rule to dlmlfi.: Ihr: v.iriahle with which they1 term isdifrcrentiatad:
1 i i i
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Complete Advanced Levoi MatnemaUcs: Pure MsDiemi
Knim . qiwlion Ihese nsulls gi\i;
. .4--
I lii, rraull iHlrueforalldrdi'M nlmi.il lln irwin. Ijfcause Llir: reJiusorigin, bnwtunqumd lerai i.i Ihe equaLion of Hie anh U 1
urn IwtonfirmHl by ronsidering the radial line Irom Ihe wnlre Olo,polnl (if.ylon Ihecirciimlmncoof lh« cirtle.
NMIwAH Hie gradient of this lineIsf MCUIM H alio inierueyls ihe CtTCkal right uiglai, II iilbenranu] lo Uudiell *l Ihis point. This means iliatIht IIWUM of the langent to the oireleatlhl« point it-f.
Example 1A cildu C Is centred al |6, -21 and has a radius of 5 units.
a Write down Ihe Cartesian oqualion oi Ihls clrciob findenesprossionforS;.r Kind ihe sradient of the eircio el the two points .vhero.i - y.
SoMton Recall that, (ora circleof ndlui r. cMitnd al |a,b],
tr-tif+ir-tf-i*
Tlie Canesion equation of Ihls oirr.lc is therefore
b Differenlialing both sides of the equation with respect to (.
lUilllllll III at Ihe
|ndksl ndlio langeiis also the gradient attbl curve (elic|p| itael
al thlt point.
Verify that the
equivalent fnnn isx'+y1 -\2i + 4y + ll
AllemallvBly.diHarenliI'ty'-lZi + ly + lS
term by term, using tlchain rule for the tori
toy.
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Using Ihri chnin rule. - G)! = 2(r - fij
So 2(jl-6)+2(y+2) = 0
Then 2(l.+ 2|£--2(«-a)
SubstiLutox = 9 inlo {x - 6)' + (y + 2)2 = 25.
Thisgives 3! + (}- +2)! - 25
B4-JJ + 4j'+4-Z5
/ i 4)- 12 = 0
(j- + 61|y-2)=0
= y = -6ory = 2.
Al ,'!,-(>:.
NNlililMhjl ill 111-, l-.Vl I,:.
.
-2.ThiScomJSpondS
loihetwopotolsbnlhBcircle whofe ihc tangBnuare paratldloUlB rrab
!B, -2)
Unlike Ihe e,|Lirflimw,f .i ni.di., iniiiiv iiin.ll.ill rim. liiive eqllaLlcinslhai include pro[igc:i [emu. Thn5e are BspressionR such as xy. xy' andx'y. These lerms can slill be dirferenlialed implicilly but require the use or
the praducl nilo.
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ComElolo Advancod Lovol Halhomatics: Pure Mather
Example!For ooch of Ihn Fallnwing, find an aipression fnr in Lerma of X and jr.
S + lxy-ix-V b +4iJ-y'-0
Sofulton
a nifferanlialc bolh sides ol Ihe equation with respect tax,
liso Ihe pmduol rule lo difforenliale Ihe secmld lertn. Let u = 3)[ and
v-y.Thenu'-aaTidv'-g.
Now A(3?,| = U1,' + WI' = 3J + 3J.ft follcuvs that iliffereiitiatidn of both sides of the equation Bives
ReatraiMtoBloflndfe
3j!jj£= 4 -2x-3y* |-4- -3y
b Difforantiate bolh sides of the equation with respect \ox.
Using the product mle, ~ 'y'] = 2* + Wand using Ihe chain mle 7')=
So 2x!J' +2x)',+ta-2>. = 0
* v(l-x!li = x(/+4)
r]tiriiijiafi! I tie n:
factor 1.
UrhfbrjrrOTlirlicti geschutzles Mak:.-im
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Pure MalhBitiates
Nmv fiiclrnki'iiiul -iiinplify llli! Pinuililin,
VRrity lhal Ihis ei|iialion can be rearraiigal [o give
When x = -2 andy = -1. = -i - -i < 0
So -1} is b ina.iii.um point on thn cn
When x = 4andy = Z,ji = i = !>0
So |4,2] Is a minimum poinl on die cu
Nolicelhal Ihe e(|llalir)H-jt 111., nurv.i In ran l.c rearranged
into the form v = f(x). Show lhal j- - ±f,. Its firet and snqonrt dertvalivw,l0 the form Show thalr.
Can Ihen he fmmd u nR the nuollBnlUse a graphical calculator to dra,v the graph oty =
has a maxtmum point at (-2. -1) and a mlnlmnin p
Conlirm lhal Ihr
point at |4, 2).
Uriiclierrechtlich geschfjliles Malorlal
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11 Oinoremiation n
11.5 Implicit Differentiation
Technique
[T] For each of [hu following circles:i write Hnwn ilsCartPEian aquaUoaii find an expression for £ in ierms ols andill caleulole Iho WJiik-M ol tirtle j[ Iho poiill P. n huio CODrdinalus
a rndiUS5,™nir8(1.2);P(S,S)
b radius 13. centre (3. -4); Pl-2.81c radius v 9. cKnLre (a, o); P (-1, v !
P| Find an e*prEssind for in (ems nf s and y for each of Iho following! a.1-2/4. = 0
b i3 + 4y - 3i)- = D0 Ex' + V-x
b 2x + 7y - Sx'y -4 = 0f 5j - 3/ + Zjy1 + 1 = 0
[3] Find Iho fitadionl of each of Iho folloninK curves al Iho point indicaled: y,-2jt,-«>. + 14=0.l(2.2)
b 4? - 3X2 - + 1J - 0 al (2,51c 3/ - - x2/ - 47 = 0 at 4]
5] For each of Iho following cui find an expression for in lerms of* and yii find Iho coonliiialH, of lli *<,,lk,m«y ,niinls(s| on lha curveiii find an expression for in lerms ot . y and iv dolermine thw nalnrn of the slalionary poinl(s|:
b 5k2+ 2) -2y-12 0c s + 12y+xV + 2 = 0
[5] Find the equslinns of Iho longonl and the normal lo each of Iho followingjesatlhepoinlsimlicoled:
a lx + 3y-V + * = 0"(-l.-2)b 1+2) + 4xv; - 12 = 0 al (2,1)c y3 + IDx + xy - 15 = 0al(B, -3|
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Example ibis pari icubrlym,|?.rN?1I.Ti.1M1.i.i?,i,.|riN1.(|?.1lim,siJrun KllipSEC,lMIi.. origin i=ocosfl,
y-bsmff.Klimin.Uns,!,.
|iii™n>;ti'r(i(!ivi'illiL'Car iiiaHiualuin Kir llu; dlipsc
.
The UmtcsiancquDlionoCnmrvc (Mil ui.iiillv lir ohUiijied Irum patamclriccquiiliDns. Eliminate the pammrtRr, I, from the Uvn pnrDmcirin tquations,x =m and j- = g(t). How is tfM Bn.riicnt of suoh a paramslrieaUy daimodcurve found? Fitsl difterc.iliaLo both j and y with respcel lo Ihe parameter(
, lo find and | resijeulively. Theji. uiini; Ihe chain rule
% = %' - "'hit:h hp " ",ritlBn 35
lualiuns thai defineFor example, d i
Ihe cirde of radius 3. centred at
the Dri|{in.arBi = 3cO!(snd
y = 3 sin (, The paranieter, (. isthe angle, in radians, measuredandduckwiw ub.mt the oriKiilfromlhsi-asis.
ThM™.:!™ I, tlli1u.i,.1ll,VM|? s,.,,,! ?.(,[;?..,forxandr. Check that
irI+y
, = (3coilj' + (3jinI|I
= 9cosIH-9!in!(
= 9(cns'l + sin'/; < cos1 + sin115 = 1
Thusi!+yz = 9,idii(:li i lu'Ciirl. ijii. mKiui.ohhistirclo.
DttferenUaliiig the two paramutric equations v = 3cos( andy = asini1vilhr™p.rtlolRives
~ = -3iinl and fe = 3,
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Comclele AQvanced Level Mainemalics Pure Maihematics
Using the chain tulo, = y <
Nnlim lha( sincni = ScoeI andy = 3sml,
dy 3cnH i
This ivas lhe resull -ibluin™! hy iiniili illy difri'tun ng lhe Carlesianequallun of Ihls drela in lhe previous section.
Example 2Find an o(pm*Rinn for Tor each nf Ihn fnilowinn paramplrically .IpfinPil
= ( + 1
Solution
- |-(S)/(|)-
Z sin ZD= -
3rmn 4 sin Zd = Zsindfasa
4.in (I,
t ros (I
ExamplesFind Iho coordinales of the puinlfs) on tht followtag paramolricallvrinfinnd rarvns whore Iho sradinnl has tho value indicated.
So/uhon
- l-(l)/(S)-(T)/( )-( >ff)-l
UrhebafrBchtlch oeschQlzlBS Malarial
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1 D her'.?-: . i cn II
i»ndy = ji=iWhBnt = 6,i = i =
b g ras9and = -Bdos1DsLnO
- -3. IheD -asinZP = -3
So sin2e = l
Thoo 2o = |,¥.?,l|i,...
and 0 = J.if,¥.1f....
II is possible lo find a generdl equalioii for Ihe tangenl, or Ibe DbnOal, alsome general point « =/((),> - s(')) a paranMlrie currs. The eci aticnof the tangent. »r normal, B) a sjlei ifit: poilll On the CUTVB can then ber,.limll,yM ,HlilulinL;;1?,ii1[1r(>i.ri:L|1.v;,l,1«..fll,nl[iran,elerf.
- Gcos"sin [J - -3smM sln2(l = 2suiUcosfl
Example 4This ciirro C h.is patnmelric ciis patnmelric cquaiinns .y = I3 sndy = 6(. Kind a senerniequation for botltllictacisi'Jjtjinhli injiinaljt souk-[mint i/1,61) on the
Write doivn (he cquotinn of Iht: taiimul la thethe equntioa at ih[
Solution
= 8
The gradient at Hint,i[ij;i-ii1.iniil th. iurniul, (atheciHpoml(f
J,6Jlarc a.id -Jf1. ruspuctivuly. Usey -j-j =di(» -.
the equal lens uftbese linea.
at)ontli..M)and
.rve at some general= mi*-x,)W find
Thccciuation otilii' tsiv+onl is
J-fll-jj
- = 4I3 or - - = 0
Mulii li IlhIi sides by ('
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Complole AOvanceO Lauel Ualhemallcs: Pure Malhemallcs
Till! [..iiialiimnfllm normal is
y-et~
= 21-12/ = -I'l+I5
» Zy + f'x f' + lH or Zy + t'x
Mullipiy bolh sidns I
M Ihn point {a.i2),ibysuhslitulins / - iinti
Z.TtM pqnalinn nflhalail»lV-lit-4 .li
mgantattbispoiiil.toliiia
i'iii
IUiepolnl(-l.-6),)=-l.Sub9tllUtlagl = -I into theBeneralinalinn for a normal tq Ihn curve 2y + t'x = Is + gives
2i' + s + 13 = 0
Stationary points and second derivativesThe spcoml rlcrivaiivn r.f ? iMrarradrin.-illy ilnrinorl r:nm h Umm\ liydlfferenllallnnMicfir.i rl.rriviiii.v >viih wpr.rA (o.vllhat iF. t tl. Rut.for most panunBttr curvaa. | will be a funqUnn of the parameler, (. andnaix. This ni.ans the chain rLle must he used tu Ehanga the yarlable by«hii:h i[ is hi-iriK ililfercnlialnii, so that
Haring (bund an eipression fnr 5. it can he used todelemine the m1,f1,i1ys|i,li..ii.tv|...inlMmiliniiiraiiieter curve,
ExamplesFind an expression for and for each of the fnllowingiiaramelrinallydefined cums:
x = 21*3 b J = 4C03»
y sin'fl
Solution
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11 Dmerenftooonll
Now
d f-5\ ill
=b J = -4sinfliind = Z!iii0cos()
- I=(I)/(S)2 inl l:rl ,l
"
-4.1?»
-»"'FJiw)
Example 6Find the coordinates of Ihc stationary points
of a [liirainclur I by j£ = + l aady l3 - 12
tti<l<!t!:r[iiiii tin- EialLini (if llicso points.
Solution
$=2Iimd = 31!-12
21
At slnliDnory poinls on the cone % = 0.
daptiii:.]!cakulalor
tuppnrl
pack
.iolvnlhisnqmlinnhyoqualing I he numotaloiloiero.
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So/ul'ill/on
-2/
Al slalinnaiy pninl! nn the curv-K, = n,
i p = 0 =- 4-21 = 0
So the statkmaiy polnl nrairs al (5, 5).To delerminK ils nature ma] In eiduiLl the second derivalive,
-5
When I = 2. | <: 0, so 15, 5] is a maximum poinl.Toskaldl lliecun
values ofl he parameler
ni.ll-mru.linrtlwfnnliffFT-Jll
s
Tijollier Willi vvhiil weknmv IiimiI Ih-- lioii.irv |i.>i]il!., n-e ran prod.iueiiskMiiir.fduiolrte;
3
UrhBtjarrechllcl- 479
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Coniplele Advanced Level Malfiematicsj Pure MaLhematics
11.6 ParametricDifferentiation
ExerciseTechnique
[TjEiiininDtothcpammDtfirlDfindthDQirtQsini.oqualinnsofthofollowinB
s
Scnsf.y = Ssinl f x = acosO.
Find on expression for for each of Ihc foUowind parEunctricaUy defined
x = 3l.y = l2 d x = AcosO. y = 3 sin If '
jttj ®aP.y = IisLnO
y = St + 5 7 = l-sln0
Kind Lho coordinates of Lhn poinl:; r-jrih ol Ihc iolltAi-ms oirvra ulnrc
Iha gradunt has the value indlcalod:
x = l'-3l b * = 5 c * = Lan(iy = + l y = 1 + «to9
jomiai 10 the curve wtU>
the poinL where ( = 1,
[4] Kind UlE! equaliuns of the lanBonl and the mparametric equations i=B,
.j'=l+B,',all
Thn curve C fins pjjraranlric nqualiors «- (* andy -21-1. Flndageneral equation for the tangent at some point (I1,2t - 1) on the curve.
lli'[u:i'. u-riUMlown liLiTK)lMlio[i rjl lh,- Untcnl Hj lli(M;urv(; jlllti. Jl.ral equatio
)wn the equation of the tangent to the
[6] Find the coordioates of the stationary points on each of the followingparamntrically defined curves. Kind also an expression for tho secondrlerivalivc and use il to tlrterminn the nature of these stationary points.Henco, or otherwise, sketch tho
x = 3l + l hx = (, + l
y = r,-o(1 y = i3 + (
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Complete AOvancBd Level MathemaLns: Pure Malhi
So Iho linear a]j|irii,\iiii.iiiiMi lo rli li I.:u nivi-s ,i v.ilm- fnr llio dofinilBInlesrai lhal ismmNi luuvu rii-i:iiiiiil iiliu.i-s. '[ III. .i]it>ripiu.ii is parliculattyuseful when evalnalind hilHgral. lhal an- .liffii-iill In -valuale esaclly.
The hinuraial LlwureriL um imlv ujtJ I" linil Ihr ,v:rU:s (.-xiiaiisions offuncliona of [ho form {u + x)", whiin-u j rjLiiirul |jiii.i;r. KiLlldiOrts mohas tlnx, cosx, e' and lux can also bo expressed as a series of ascondingpowers of x uiing Iho Maclaurin serios.
The Maclaurln series
Sup] flxl iiiiiinn fiim-lion of v I lull 1:111 Iw. Hrillcibof jc, such lhal
n-ie/r.M issoi
MliUll(! pon.-is
fix) = Oj + n,i + OfX1 + nj*1 +... + ay +.
ivW<(, iMht! i:oi!rai:ii-nlof lhi;.v'li!rn.. A umi-lliiil fis a fl
lhal can be Lontinuouslr riifferonlialod to find/V)./"!*! and it> hlghdcrivaliv t. IL follows lhal
/V) - + 2a,I + lOji1 + 4a,i3 + ...
/"(*) - ZOi + 6ajl + 120 + ZDOsi1 + ..,
/"(t) - 6oj + 240 + eOajn1 + laaosu1 +...
= MO* + l!no,( + 3601, + fl x1 + ?. and so on. /%t) danotai Lha
Siil-::iliii:ri!' \ 11 inrn llii' ' ri|jjii-:Liiri
fiO) = a, s n, = m
/"(O) = Ba3 = 3! « Uj =03 =
rm-... = «..
where/ D) is Ihs value of ihe nh derivative of/M al x = 0.SiilnlilulinglhwiMhir-iforlhe ™fli
fourth derivative of/(:
:. n., II.
l(ir(i;v;);in
HieflioienlsOD, O,,!!,, Oj, o, 0,...
4 Learn lliis result.
oM aeschuteles Material
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ComplaleAOvairced Level
EiampleSUse the W.-icl.iiiriii series expansion to find the cubic npproxi root ion ofhi(l +*). Hoqcp End Ihe approxinuite voluo of In(l.l).
Solution
/.(x)=(l+x)-' => f(0) = 1
rM=2(l+i)'1 =>r(D = 2. nnd so on.
lliBMidaWto saHeSforJnO +k)I3 Lheiefore
nnd lbs cubic ppmxiraalinn is
SulUtUutiagx-O.I gives
lll{lll)B0.1-J(O:l)1+J(ai}'K0.1 - 0.005 -0.000 33
= 0.0353 (4 d.p.)
Check lbiE resuil UStc lculnlor.
Hve !lLMlinSllic luslnirdedviKivEsorind +«)whimiloslimvlh.il lbe\l:irl:iurin;r.rie lorlnd 1 x) is
- D, il is possible
This I'xpjnsimi is uriiy viilid iiir -1 <*< 1.
Bepbcings wilh -I in Ibis serifis gives
Notice the condition
the inequalities,
This expansion is only valid tot -1 < x
Tho MaoUurin expansion cannot be used to find a power serios far luxbecause the function and its derivatives Ax) = J. M = - J.fM = J, and so on, are not defined fori = 0,
Urhebofrechllicli oeschiitzlos Material
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11 OjlTerenllafion II
11.7 Maclaurin SeriesExerciseTechnique
Find Ihcfirel three m in Iho MaQlnunn sciics tfipansioiis ioi:
d Imi.v
h x'o" c ln|l + Mr)
[21 U<o tho quodmlic npproximation for cos K ohlalnud from iLG Madaiuinsorios to nolrn Lho equation cos 2s = 3k. correct to two ducimnl places.
[3] Find tho first Ihreo non-zon. timns In tho Mndourin sorios nxpansion oflull + K] ond ln(l - 2i), Honco, ivritn rimvn a cnbte apptonimation forI" 1) ""d. by subslituting 1 = 0.1 into it, find tho approxiinDte value oiIn 1,5 to three decimal places.
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v.
-
,ii or. Pure Maihomatlcs
ConsolidationExercise A
[T] Given lhaL j- = ". linci g. H.poinlonlhaciirvsr xfl
Hance Bnd the f:aoniinalfls of Ihs slalinnaty
lUCLESj
[2] A curve is deftned by tlu pMameiric equnlinns s = (- + 3( and
a Finci inlErmnfJ.b Thp nomml lo Ihc nutvu al Ihi; poinl V has gradlenl J. Ddtrmino lire
cooidlnales ill P.
mm
The- dinprnro shdWl 9 mUgh sketch of Lhc graph of y = (. -
a Findanoipressionforg.b Uv considoring Iho padionl of Iho curve al Ihe poinl wheia x = 4.
dMomiinc uh-.'llifr llif .v-tuordinalc of Ihe maximum point on IhcB ph isle hnncrgieelerthi,. 4.
[4] A cum. C is given by Ihe equalions x -0 < ( < where (is a peramater.
2 cos I + sin 2t,ym
a FindSand lnwnnsotl.b Find Iho valua of gal Iho poinl P on C, where ( = 3.c Find an oqnalion of Ihe normal lo the curve al P,
(ULEACJ
[S\ Use Maclaurin's theorem lo show thai for sufficiently small values of»,
(l+x'llan-'jax + l -Ax5
INICCEA)
Urheborrechllidi geschutiles Mali
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i V.i:ii-L'!.:i:.ci Pu.-e Mamemalies
13.1 Approximate Solutions ofEquations
Try solving Ihs Bqualloos Ztiosx + 1 ande' = x + a. It you Iriudtosdvr lh™ Utog algebraic techaiqUES Ihe lerapialinn is to Bive up and sayIhc PC|ualions ca[in..l li ilvil. Mnw r, -r.ipliir.d. or iltralivo melhodsnan be used lo and an upproximatB value lor lha snlutiDD lo theseEquations. These techniques generate numeriial values oflncreaslng
accmacy. They ars basrf on tnpnMw ' pronoriorn nr algariihn, untilsumcien! accuracy has been achieved.
Graphical methods
y = D.
r (s) r iou . (|,Mlmn ..ni,.- (-.,?! flM = IH m, I... lo?,..l l.v [Ira.-ios
{raph oly = f(vl ...nliuB olf Ih,- .,|,proxiraate values of I fur »-l,lch
Example 1Conatnid a table of values lot)' = 2x3 - IZx + 11 wllh 0<x<6. Drawthe graph of J" it' - 1ZJ + 11 lo that range,
and use It lo Und
appKHiroatBEolntlansaf Ihu equation 2 - !2v + ll U. lo ooe detlmal
/Ul-ll where Ihe ginooai the i-a<is.
T t
UrtieboftBchllctt fleschutzll
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