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

  • A
    $\frac{1}{2}\left[\tan ^{-1}\left(\frac{x^2}{2}\right)+\log \left(\frac{\sqrt{x^4+4}}{2}\right)\right]+C$
  • B
    $\frac{1}{2} \tan ^{-1}\left(\frac{x^2+2}{2 x}\right)+C$
  • C
    $\frac{1}{2}\left[\tan ^{-1}\left(\frac{x^2}{2}\right)-\log \left(\frac{\sqrt{x^4+4}}{4}\right)\right]+C$
  • D
    $\frac{1}{\sqrt{2}} \tan ^{-1}\left(\frac{x^2+1}{\sqrt{2} x}\right)+C$

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