Cos 2x cosx 2 sin 2x sinx. Cos2x + sin2x+ 1. Cos и sin 2x. Вывод cos2x. Sin x + cos x. 4sin2x cos3x 2sin5x tg2x. 2sin x2 = 0.5. Sin x/2 + cos x/2 + sin x/2 * cos x/2 = 1. Cos5x+sin3x 0. Sin x + sin 2 x 2 = cos 2 x 2. Sin2x+sin2x=3. Sin7x-sinx cos4x. 2sin2x-7cos2x=2