" (xiii) "a cos A+b cos B+c cos C=2a sin B sin C

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

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

For any triangle ABC,prove that a cos A+b cos B+c cos C=2a sin B sin C

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

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

In a triangleABC, prove that a cos A+b cos B+c cos C=2a sin B sin C

In any triangle ABC, prove that following: quad a cos A=b cos B=c cos C=2b sin A sin C=2c sin A sin B

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

If A+B+C=pi/2 prove the following (i) sin 2A+sin 2B +sin 2C=4 cos A cos B cos C (ii) cos 2A +cos 2B+cos 2C=1+4 sin A sin B sin C.