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[" In "/ABC,A+B+C=pi" show that "],[" 1)...

[" In "/_ABC,A+B+C=pi" show that "],[" 1) "cos2A+cos2B+cos2C],[=-1-4cos A cos B cos C]

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Theorem 2:cos2A+cos2B+cos2C=-1-4cos A cos B cos C

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