$\int \frac{x^2-2}{x^3 \sqrt{x^2-1}} d x=$

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

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