$\int \frac{x^3}{x^4+3 x^2+2} d x=$
- A
$\log \left(\frac{x^2+2}{\sqrt{x^2+1}}\right)+C$
- B
$\log \left(x^2+2\right)-2 \log \left(x^2+1\right)+C$
- C
$\log \left(\frac{\left(x^2+2\right) x}{\sqrt{x^2+1}}\right)+C$
- D
$\log \left(\frac{x^2+1}{\sqrt{x^2+2}}\right)+C$
✓ Correct answer: A
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