Indefinite Integration

$\left(\frac{-x^4+1}{x^4}\right)^{\frac{1}{4}}+c$, where $c$ is constant of integration.

$\left(x^4+1\right)^{\frac{1}{4}}+\mathrm{c}$, where c is constant of integration.

$-\left(x^4+1\right)^{\frac{1}{4}}+\mathrm{c}$, where c is constant of integration.

$-\left(\frac{x^4+1}{x^4}\right)^{\frac{1}{4}}+c$, where $c$ is constant of integration.