MCQ
$\int \frac{x^4+1}{x^2+1} d x=$
- A$\frac{x^3}{3}+c$
- ✓$\frac{x^3}{3}-x+2 \tan ^{-1} x+c$
- C$2 \tan ^{-1} x+c$
- D$\frac{x^3}{3}+x+2 \tan ^{-1} x+c$
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