Photos SIN X COS 7X

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Sin x cos 7x. Cos2x= cos^2(x)-sin^2(x). 2sin2x=3cos2x. (2sin x/2 -1)*(1-cos 2x) =0. Y=2sin x решение задачи.
Cos2x= cos^2(x)-sin^2(x). 2sin2x=3cos2x. (2sin x/2 -1)*(1-cos 2x) =0. Y=2sin x решение задачи.

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