अवकलज ज्ञात कीजिए: $\frac{d}{dx} \cos^{-1} \left( \frac{x - x^{-1}}{x + x^{-1}} \right)$

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

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