Report copyright - Scanned with CamScanner · 2019. 12. 1. · cos4 x — sin4 x = cos 2x = I + sin2x (sin x + cos x)2 I + cos I()y = 2 cos2 5y 59. 6 sin — cos — 61. sin 59 cos 39 63. 5 cos(—5ß)
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