$\tan^{-1}\left( \frac{\sqrt{1+x} - \sqrt{1-x}}{\sqrt{1+x} + \sqrt{1-x}} \right)$ का अवकल गुणांक ज्ञात कीजिए।

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

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