differentiation

Question: $\frac{d}{{dx}}\left( {{{\tan }^{ - 1}}\frac{{\cos x}}{{1 + \sin x}}} \right) = $



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

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