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

If A+B+C=pi then prove that sin2A-sin2B+sin2C=4cos A sin B cos C

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

If A+B+C =pi , prove that sin 2A+sin 2B+sin 2C=4 sin Asin B sin C.

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

If A + B + C = pi , prove that sin 2A + sin 2B + sin 2C= 4 sin A sin B sin C

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

If A+B+C=(pi)/(2) ,prove that: sin 2A+"sin" 2B+"sin" 2C=4 cosA cos B cos C.

If A, B, C are angles of a triangle , prove that sin 2A+sin 2B-sin 2C=4cos Acos 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.

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