\[ \int \left (\frac {b}{x^4}\right )^{2/3} \, dx \]
Optimal antiderivative \[ -\frac {3 \left (\frac {b}{x^{4}}\right )^{\frac {2}{3}} x}{5} \]
command
integrate((b/x^4)^(2/3),x, algorithm="giac")
Giac 1.9.0-11 via sagemath 9.6 output
\[ -\frac {3}{5} \, x \left (\frac {b}{x^{4}}\right )^{\frac {2}{3}} \]
Giac 1.7.0 via sagemath 9.3 output
\[ \int \left (\frac {b}{x^{4}}\right )^{\frac {2}{3}}\,{d x} \]________________________________________________________________________________________