Question
Sun July 29, 2012 By:

Prove that:

Expert Reply
Mon July 30, 2012
(1 / {tan 3A - tan A}) =(cot 3A cot A)/(cot A - Cot 3A)
 
 
1/(cot 3A - cot A) = - 1/(cot A - cot 3A)
 
On subtracting, we get,
(1 + cot 3A cot A)/(cot A - cot 3A) = cot (3A - A) = cot2A
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