જો $y = \tan^{-1}\left( \frac{x}{1 + \sqrt{1 - x^2}} \right)$ હોય,તો $\frac{dy}{dx} = $

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

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