यदि $f(x) = \tan^{-1}\left( \frac{\sin x}{1 + \cos x} \right)$ है,तो $f'\left( \frac{\pi}{3} \right) = $

  • A
    $\frac{1}{2(1 + \cos x)}$
  • B
    $\frac{1}{2}$
  • C
    $\frac{1}{4}$
  • D
    इनमें से कोई नहीं

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