$\frac{d}{dx} \left( \tan^{-1} \left( \frac{\sqrt{1 + x^2} - 1}{x} \right) \right)$ का मान ज्ञात कीजिए।

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

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