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

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

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