$\frac{d}{dx}\left( \tan^{-1}\sqrt{\frac{1 + \cos(x/2)}{1 - \cos(x/2)}} \right)$ का मान ज्ञात कीजिए।

  • A
    $- \frac{1}{4}$
  • B
    $\frac{1}{2}$
  • C
    $- \frac{1}{2}$
  • D
    $\frac{1}{4}$

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