$\int \sqrt{x-1}(x \sqrt{x+1})^{-1} d x=$

  • A
    $\ln \left|x+\sqrt{x^2-1}\right|-\sec ^{-1}(x)+c$
  • B
    $\ln \left|x-\sqrt{x^2-1}\right|-\tan ^{-1}(x)+c$
  • C
    $\ln \left|x+\sqrt{x^2-1}\right|+\sec ^{-1}(x)+c$
  • D
    $\ln \left|x+\sqrt{x^2-1}\right|-\tan ^{-1}(x)+c$

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