differentiation

Question: If $y = {\tan ^{ - 1}}\sqrt {\frac{{1 + \cos x}}{{1 - \cos x}}} $, then $\frac{{dy}}{{dx}}$ is equal to



1) 0
2) $ - \frac{1}{2}$
3) 01-Feb
4) 1
Solution: Explanation: Explanation
standard-differentiation

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