\[ \int \frac {x^2}{\sqrt {a+\frac {b}{x^4}}} \, dx \]
Optimal antiderivative \[ \frac {x^{3} \sqrt {a +\frac {b}{x^{4}}}}{3 a}+\frac {b^{\frac {3}{4}} \sqrt {\frac {\cos \left (4 \,\mathrm {arccot}\left (\frac {a^{\frac {1}{4}} x}{b^{\frac {1}{4}}}\right )\right )}{2}+\frac {1}{2}}\, \EllipticF \left (\sin \left (2 \,\mathrm {arccot}\left (\frac {a^{\frac {1}{4}} x}{b^{\frac {1}{4}}}\right )\right ), \frac {\sqrt {2}}{2}\right ) \left (\sqrt {a}+\frac {\sqrt {b}}{x^{2}}\right ) \sqrt {\frac {a +\frac {b}{x^{4}}}{\left (\sqrt {a}+\frac {\sqrt {b}}{x^{2}}\right )^{2}}}}{6 \cos \left (2 \,\mathrm {arccot}\left (\frac {a^{\frac {1}{4}} x}{b^{\frac {1}{4}}}\right )\right ) a^{\frac {5}{4}} \sqrt {a +\frac {b}{x^{4}}}} \]
command
integrate(x^2/(a+b/x^4)^(1/2),x, algorithm="fricas")
Fricas 1.3.8 (sbcl 2.2.11.debian) via sagemath 9.6 output
\[ \frac {x^{3} \sqrt {\frac {a x^{4} + b}{x^{4}}} - \sqrt {a} \left (-\frac {b}{a}\right )^{\frac {3}{4}} {\rm ellipticF}\left (\frac {\left (-\frac {b}{a}\right )^{\frac {1}{4}}}{x}, -1\right )}{3 \, a} \]
Fricas 1.3.7 via sagemath 9.3 output
\[ {\rm integral}\left (\frac {x^{6} \sqrt {\frac {a x^{4} + b}{x^{4}}}}{a x^{4} + b}, x\right ) \]