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Cos2x tg. Ctg2x. Sin(3х+1)=-((2)^1/2)/(2). Ctg2x+tg2x=1. Уравнение cos2x + sin2x.
Ctg2x. Sin(3х+1)=-((2)^1/2)/(2). Ctg2x+tg2x=1. Уравнение cos2x + sin2x.

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