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Решение уравнений cosx-cos2x=sin3x. 3cos2=sin2x+sin2x. 3-Sin2x-cos2x. Sin x + sin 3x.
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Решение уравнений cosx-cos2x=sin3x. 3cos2=sin2x+sin2x. 3-Sin2x-cos2x. Sin x + sin 3x. 