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