$\int \frac{x^3}{x^4+3 x^2+2} d x=$

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

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