Question: If A + B+ C = 180, prove that 1 sin 2 A + sin 2 B- sin 2 C = 4 cos A

If A + B+ C = 180, prove that 1 sin 2 

If A + B+ C = 180, prove that 1 sin 2 A + sin 2 B- sin 2 C = 4 cos A cos Bsin C %3D %3D

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