$\int \frac{1}{x^2\sqrt{1+x^2}} dx =$

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

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