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[" If "A+B+C,=pi," prove that "],[,cos2A...

[" If "A+B+C,=pi," prove that "],[,cos2A+cos2B+cos2C=-1-4cos A cos B cos C]

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If A+B+C=pi , prove that cos 2A +cos 2B +cos 2C=-1-4cos A cos Bcos C.

If A+B+C=pi , prove that cos 2A +cos 2B +cos 2C=-1-4cos A cos Bcos C.

If A+B+C=pi , prove that : cos2A+cos2B+cos2C=-1-4cosA cosB cosC

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