$\tan ^{-1}\left(\frac{\sqrt{1+x}-\sqrt{1-x}}{\sqrt{1+x}+\sqrt{1-x}}\right)$ का अवकलज क्या है?

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

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