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0 x π. Cos 1/2. Cos^2(π-x)-sin(π/2-x)=0. Cos2x 0 на окружности. 2 Π cos α . 2       .
Cos 1/2. Cos^2(π-x)-sin(π/2-x)=0. Cos2x 0 на окружности. 2 Π cos α . 2       .

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