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[" 19.If "A+B+C=(3 pi)/(2)" ,then "cos2A...

[" 19.If "A+B+C=(3 pi)/(2)" ,then "cos2A+cos2B+cos2C" is equal to "],[[" (A) "1-4cos A cos B cos C," (B) "4sin A sin B sin C],[" (C) "1+2cos A cos B cos C," (D) "1-4sin A sin B sin C]]

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