Indefinite Integration

$\frac{\left(x^2+1\right)^n}{x}+C$

$\frac{x}{\left(x^2+1\right)^n}+C$

$x\left(x^2+1\right)^{n-1}+C$

$\frac{x}{\left(x^2+1\right)^{n-1}}+C$