differentiation

Question: If $f(x) = {\tan ^{ - 1}}\left( {\frac{{\sin x}}{{1 + \cos x}}} \right)$,then $f'\left( {\frac{\pi }{3}} \right) = $

1) $\frac{1}{{2(1 + \cos x)}}$

2) $\frac{1}{2}$

3) $\frac{1}{4}$

4) None of these

Solution:

Explanation: Explanation

standard-differentiation

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