$y=\tan ^{-1}\left(\frac{\sqrt{1+x^2}-1}{x}\right)$ का अवकलज क्या है?

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

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