$\int \left[ \frac{\log x - 1}{1 + (\log x)^2} \right]^2 dx = $

  • A
    $\frac{x}{1 + \log x} + c$
  • B
    $\frac{x}{1 + (\log x)^2} + c$
  • C
    $\frac{x^2}{1 + (\log x)^2} + c$
  • D
    $\frac{1}{1 + (\log x)^2} + c$

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