\[ \int \frac {1}{\sqrt {\sec (c+d x)} (a+a \sec (c+d x))^{5/2}} \, dx \]
Optimal antiderivative \[ -\frac {75 \arctanh \left (\frac {\sin \left (d x +c \right ) \sqrt {a}\, \left (\sqrt {\sec }\left (d x +c \right )\right ) \sqrt {2}}{2 \sqrt {a +a \sec \left (d x +c \right )}}\right ) \sqrt {2}}{32 a^{\frac {5}{2}} d}-\frac {\sin \left (d x +c \right ) \left (\sqrt {\sec }\left (d x +c \right )\right )}{4 d \left (a +a \sec \left (d x +c \right )\right )^{\frac {5}{2}}}-\frac {13 \sin \left (d x +c \right ) \left (\sqrt {\sec }\left (d x +c \right )\right )}{16 a d \left (a +a \sec \left (d x +c \right )\right )^{\frac {3}{2}}}+\frac {49 \sin \left (d x +c \right ) \left (\sqrt {\sec }\left (d x +c \right )\right )}{16 a^{2} d \sqrt {a +a \sec \left (d x +c \right )}} \]
command
integrate(1/(a+a*sec(d*x+c))^(5/2)/sec(d*x+c)^(1/2),x, algorithm="maxima")
Maxima 5.46 SBCL 2.0.1.debian via sagemath 9.6 output
\[ \text {output too large to display} \]
Maxima 5.44 via sagemath 9.3 output \[ \text {Timed out} \]_____________________________________________________