$\int \frac{x^5+x}{x^8+1} dx =$

  • A
    $\frac{1}{2 \sqrt{2}} \tan ^{-1}\left(\frac{x^4-1}{\sqrt{2} x^2}\right)+c$
  • B
    $\log \left(x^5+x^2\right)-\log \left(x^3+x\right)+\log (x+1)+c$
  • C
    $\frac{2}{9} x^8-\frac{4}{9} x^6+\frac{1}{9} x^4-\frac{1}{3} x^2+c$
  • D
    $\frac{1}{\sqrt{2}} \tan ^{-1}\left(\frac{x^5-1}{\sqrt{2} x^3}\right)+c$

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