(a) By differentiating the double-angle formula cos 2x
Chapter , Problem 68(choose chapter or problem)
(a) By differentiating the double-angle formula cos 2x cos2 x 2 sin2 x obtain the double-angle formula for the sine function. (b) By differentiating the addition formula sinsx 1 ad sin x cos a 1 cos x sin a obtain the addition formula for the cosine function.
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