Images 4 COS 4X

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4 cos 4x. Sin5x=cos4x. Sin5x*cos4x - cos5x*sin4x=1. Sin 4 x/4 - cos 4 x/4 = cos (x-. Cos4x 1 решение.
Sin5x=cos4x. Sin5x*cos4x - cos5x*sin4x=1. Sin 4 x/4 - cos 4 x/4 = cos (x-. Cos4x 1 решение.

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