differentiation

Question: $\frac{d}{{dx}}\log \tan \left( {\frac{\pi }{4} + \frac{x}{2}} \right) = $



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

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