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Cos 3pi 2 2x. Cos 2pi/2. Cos 3пи/2+x. Cos(3pi/2+x). Синус Pi 2 Pi. Cos 2пи/2. Cos(Pi/2 - a) формула. Cos x пи на 2. 1-4cos2 x-5pi/12 корень из 3 cos2x. 1 4cos 2 x 5pi/12 3cos2x. Cos x 3 Pi 4 корень 2 2. 1-4cos^2(x-5пи/12)=корень из 3 cos2x. Решить неравенство cosx≤−2√2