2sin 2x cos x 0. Sin2x cos2x. 2 Sin x cos x. Cos2x-sin(-x)=0. Cos2x=0. Sin2x+2cos2x+cos2x. Sin2x-4sinxcosx-5cos2x 0. 2sin2x+5sinxcosx+2cos2x. 2sin^x-cos^x-5sinxcosx=0. Sin2x-cosx=0. Sin2x=0. Sin^2x/x^2. Sin2x + sin x. Cos и sin 2x. Cos в квадрате 2x. Ответ cos x 6 + sin6 x = 1_4 sin 2 2 x