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

  • A
    $\cos^{-1}x + c$
  • B
    $\sec^{-1}x + c$
  • C
    $\cot^{-1}x + c$
  • D
    $\tan^{-1}x + c$

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