$\int \frac{x^3-1}{x^3+x} dx =$

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

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