1) (cos2x - sin2x)^2 = sin4x 2) sin^2x + sin2x = (sinx - cosx)^2

Question

1) (cos2x - sin2x)^2 = sin4x
2) sin^2x + sin2x = (sinx - cosx)^2

Answer 1

Первое знаю второе невыходит

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