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" 1.Prove that "a cos A+b cos B+c cos C=...

" 1.Prove that "a cos A+b cos B+c cos C=4R sin A sin B sin C" ."

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Prove that a cos A + b cos B + c cos C = 4 R sin A sin B sin C.

Prove that a cos A + b cos B + c cos C = 4 R sin A sin B sin C.

Prove that a cos A + b cos B + c cos C = 4 R sin A sin B sin C.

If A+B+C=(pi)/(2) , then prove that cos 2A + cos 2B + cos 2C=1+4 sin A sin B sin C .

In /_\ABC ,Prove that a cos A + b cos B + c cos C = 2a sin B sin C

(iii) a cosA + b cos B + c cos C = 4R sin A sin B sinC

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

In any DeltaABC , prove that : a cos A + b cos B + c cos C = 2a sin B sin C

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