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2sinx cos 2x. Cosx=-1/2. 1-Cos2x. Sin x + cos x. Cosx 2 1 2 на отрезке 0 4п. Cos x 1/2 решение. Cos x = 1. Cos x 2 1 2 на отрезке 0 4п. 2cos2x sinx 1 0 решите уравнение. Cos2x sinx 0 решение. 2cos^2x-sinx+1=0. 2cos^2x+sinx+1. 1 Cosx 2 sin x/2. 2(Cosx+cos3x)