trigonometry - math.utah.edu
Post on 16-Oct-2021
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All the things I have to teach and the kids can’t remember – a few I heard back from
Graphing trig functions
Special triangles
Proving identities
Double/half angle; sum of angles formulas
Things I wonder how we teachThings I wonder how we teach Special triangles
Graphing sine and cosine
Trig identities – cosine of the sum of two angles,
Law of sines, law of cosines,
The word sine:The word sine: The Sanskrit word for chord-half was jya-ardha, which was
sometimes shortened to jiva.This was brought into Arabic as jiba, and written in Arabic simply with two consonants jb,vowels not being written Later Latin translators selected the vowels not being written. Later, Latin translators selected the word sinus to translate jb thinking that the word was an arabicword jaib, which meant breast, and sinus had breast and bay as two of its meanings. In English, sinus was imported as "sine".
The word cosine?
An interesting problem!?An interesting problem!? Find the rational value of
80tan70tan60tan50tan40tan30tan20tan10tan
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