Q. 104.7( 3 Votes )

Prove that:

Answer :


Cross multiplying we get,


Cot A . cos A . cot A . cos A = (cot A + cos A) (cot A – cos A)


Cot2A . cos2A = (Cot2A – cos2A)


[By applying : (a + b)(a – b) = a2– b2]


Taking R.H.S = (Cot2A – cos2A)






= Cot2A . cos2A = L.H.S


Hence, Proved.


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