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" Show that "a cos A+b cos B+c cos C=4R ...

" Show that "a cos A+b cos B+c cos C=4R sin A sin B sin C=2Delta/R

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

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

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

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

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