$\int_a^b \frac{\log x}{x} \, dx = $

  • A
    $\log \left( \frac{\log b}{\log a} \right)$
  • B
    $\log (ab) \log \left( \frac{b}{a} \right)$
  • C
    $\frac{1}{2} \log (ab) \log \left( \frac{b}{a} \right)$
  • D
    $\frac{1}{2} \log (ab) \log \left( \frac{a}{b} \right)$

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