$\frac{d}{dx} \left\{ \sin^2 \left( \cot^{-1} \sqrt{\frac{1 + x}{1 - x}} \right) \right\} =$

  • A
    $0$
  • B
    $\frac{- 1}{2}$
  • C
    $\frac{1}{2}$
  • D
    $- 1$

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