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[" st "|A+B+C=2 pi" ,prove that "],[cos^...

[" st "|A+B+C=2 pi" ,prove that "],[cos^(2)B+cos^(2)C-sin^(2)A-2cos A cos B cos C=0]

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If A+B+C=2 pi, then prove that cos^(2)B+cos^(2)C-sin^(2)A=2cos A cos B cos C

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