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

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

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