\[ \int \frac {1}{\left (\cosh ^2(x)+\sinh ^2(x)\right )^3} \, dx \]
Optimal antiderivative \[ \frac {\arctan \left (\tanh \left (x \right )\right )}{2}+\frac {\mathrm {sech}\left (x \right )^{2} \tanh \left (x \right )}{2 \left (1+\tanh ^{2}\left (x \right )\right )^{2}} \]
command
integrate(1/(cosh(x)**2+sinh(x)**2)**3,x)
Sympy 1.10.1 under Python 3.10.4 output
\[ \text {output too large to display} \]
Sympy 1.8 under Python 3.8.8 output \[ \text {Timed out} \]_____________________________________________________