यदि $y = \cot^{-1} \left( \frac{1 + x}{1 - x} \right)$ है,तो $\frac{dy}{dx} = $

  • A
    $\frac{1}{1 + x^2}$
  • B
    $-\frac{1}{1 + x^2}$
  • C
    $\frac{2}{1 + x^2}$
  • D
    $-\frac{2}{1 + x^2}$

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