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Sin2x. 2sinx=sin2x. Sin x * cos x + 2sin x * sin x = cos x * cos x. Cos2x= cos^2(x)-sin^2(x).
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Sin2x. 2sinx=sin2x. Sin x * cos x + 2sin x * sin x = cos x * cos x. Cos2x= cos^2(x)-sin^2(x). 