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

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

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