differentiation

Question: $\frac{d}{{dx}}\left[ {\log \sqrt {\frac{{1 - \cos x}}{{1 + \cos x}}} } \right] = $



1) $\sec x$
2) $\cos {\rm{ec}}\,x$
3) $\cos {\rm{ec}}\frac{x}{2}$
4) $\sec \frac{x}{2}$
Solution: Explanation: Explanation
standard-differentiation

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