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If A + B + C = (3pi)/2, then cos 2A + co...

If `A + B + C = (3pi)/2`, then `cos 2A + cos 2B + cos 2C` is equal to (A) 1 - 4 cos A cos B cos C(B) 4 sin A sin B sin C(C) 1 + 2 cos A cos B cos C(D) 1-4 sin A sin B sin C

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