" co) "sin2A+sin2B-sin2C=-4sin A sin B cos C

If A+B+C=180^(@), show that sin2A-sin2B-sin2C=-4sin A cos B cos C

If A + B + C =180^@ , prove that : sin^2 A+ sin^2 B-sin^2 C=2 sin A sin B cos C .

If A+B+C=0^(@) then prove that sin2A+sin2B+sin2C=-4sin A sin B sin C

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

Theorem 1:sin2A+sin2B+sin2C=4sin A sin B sin C

If A+B+C=180^(@), then prove that sin2A+sin2B+sin2C=4sin A sin B sin C

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

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