$\int \frac{\sqrt{x^2-a^2}}{x} d x = \_\_\_\_$

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

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