Q8 of 90 Page 8

Prove that:

Take L.H.S.:



Multiplying & Dividing by 2:



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


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










= tan 8A


= R.H.S.


Hence Proved


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