$y = \log \left( \frac{\sqrt{x^2+1}-x}{\sqrt{x^2+1}+x} \right) \Rightarrow \frac{dy}{dx} = $

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

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