1. If 1/(1 + cosA) + 1/(1 - cosA) = x , then value of x is
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By: anil on 05 May 2019 02.09 am
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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