यदि $y=\tan ^{-1} \sqrt{\frac{1+\cos x}{1-\cos x}}$,तो $\frac{d y}{d x}=$

  • A
    $1$
  • B
    $\frac{3}{2}$
  • C
    $\frac{1}{2}$
  • D
    $\frac{-1}{2}$

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