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" If "A+B+C=180^(@)," Prove that "cos2A+...

" If "A+B+C=180^(@)," Prove that "cos2A+cos2B+cos2C=-1-4cos A cos B cos C.

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If A+B+C=180^@ , then prove that cos2A + cos2B +cos2C=-1-4cosA cosB cosC .

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

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If A + B + C =180^@ , prove that : cos^2 A+ cos^2 B+cos^2 C=1-2 cos A cos B cosC .

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