Solution
Expression : $$\frac{1}{1 + cos A} + \frac{1}{1 - cos A}$$
= $$\frac{(1 - cos A) + (1 + cos A)}{(1 + cos A)(1 - cos A)}$$
= $$\frac{2}{1-cos^2A} = \frac{2}{sin^2A}$$
= $$2cosec^2 A$$
=> Ans - (C)
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