Решите как уравнение 1) 2 cosx^2-cosx-1=0 2) 5 sin^2x+6cosx-6=0 3) cos3x-cosx=0 4) sin^2x+2sin^2x+3sin^2x=0 5) sin3x+sinx=0 6) (sinx+cosx)^2=1+корень из 2/2
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