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Cos 2x 2cos x. Cos2x 2cosx-1. Cos2x=1/2. Cos*x=x^2+1. Cos x = 1. Решение уравнения косинус х равен 1/2. Cos4x 1 решение уравнения. Cosx 1 2 решение уравнения. Cosx 1 решение уравнения. Cos2x=2cos^2x. Cos(2x+x). CSC^2x. Докажите тождество 1-cos2x/1+cos2x. 2cos2x cosx -1 равно 0