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[" DXAMPLE "5," If "A+B+C=pi," prooe tha...

[" DXAMPLE "5," If "A+B+C=pi," prooe that "],[,cos4A+cos4B+cos4C=-1+4cos2A cos2B cos2C]

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

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

If A+B+C+pi , prove that cos4A+cos4B+cos4C=-1+4cos2Acos2Bcos 2C.

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

If A+B+C = pi , prove that : cos2A +cos2B +cos2C =-1-4cosAcosBcosC .

If A+B+C = pi , prove that : cos2A +cos2B +cos2C =-1-4cosAcosBcosC .

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 : cos 2A + cos 2B + cos 2C = -1-4 cos A cos B cos C .

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