Answer :

Take L.H.S.:



Multiplying & Dividing by 2:



{ 2 sin A sin B = cos (A – B) – cos (A + B);


2 sin A cos B = sin (A + B) + sin (A – B) &


2 cos A cos B = cos (A + B) + cos (A – B)}












= tan A


= R.H.S.


Hence Proved


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