$\int \frac{x}{x^4 - 1} dx = $

  • A
    $\frac{1}{4} \log \left| \frac{x^2 - 1}{x^2 + 1} \right| + c$
  • B
    $\frac{1}{4} \log \left| \frac{x^2 + 1}{x^2 - 1} \right| + c$
  • C
    $\frac{1}{2} \log \left| \frac{x^2 - 1}{x^2 + 1} \right| + c$
  • D
    $\frac{1}{2} \log \left| \frac{x^2 + 1}{x^2 - 1} \right| + c$

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