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" 1."(a)cos2A+cos2B+cos2C=-1-4cos A cos ...

" 1."(a)cos2A+cos2B+cos2C=-1-4cos A cos B cos C

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In a /_ABC prove that cos2A+cos2B+cos2C=-1-4cos A cos B cos 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=-1-4cos A cos Bcos C.

If A+B+C=180^(@) then cos2A+cos2B+cos2C=1-4cos A cos B cos C 2.If A+B+C=0 then cos A+cos B+cos C=-1+4(cos A)/(2)(cos B)/(2)(cos C)/(2)

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

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

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 : cos2A+cos2B+cos2C=-1-4cosA cosB cosC

cos2B + cos2A-cos2C = 1-4sin A sin B cos C