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