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Дано sin. Cos^2(α)+cos^2(п/3+α)+cos^2(п/3-α)=3/2. Cos 2п/3. 3п/2 2п. Cos 3п/8.
Cos^2(α)+cos^2(п/3+α)+cos^2(п/3-α)=3/2. Cos 2п/3. 3п/2 2п. Cos 3п/8.

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