# Prove that:

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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