यदि $y = \tan^{-1} \left[ \sqrt{\frac{1 + \cos(x/2)}{1 - \cos(x/2)}} \right]$ है,तो $\frac{dy}{dx} = $

  • A
    $\frac{-1}{3}$
  • B
    $\frac{-1}{4}$
  • C
    $\frac{1}{3}$
  • D
    $\frac{1}{4}$

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