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Sin 2x 2 cos 2x 2 cos2x. Cos2x + sin2x+ 1. Cos и sin 2x. Вывод cos2x. Sin x + cos x. Cos2x sinx 0 0 5п/2. Корень3cos2x+sin2x=0. Cos^2x-4sinx+3=0. Cos 3pi 2 2x корень 3 sinx. Cos2x+sin2x 0.25. Cos2x sin2 Pi/2 -x -0.25. Cos(2п-2x). Cos 2x cos2x 0.25. Cos2x= cos^2(x)-sin^2(x)