$\frac{d}{dx} \left( \log \left( \sqrt{x + \sqrt{x^2 + a^2}} \right) \right) = $

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

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