\[ \int \cos ^6(c+d x) (b \sec (c+d x))^{3/2} \, dx \]
Optimal antiderivative \[ \frac {2 b^{5} \sin \left (d x +c \right )}{9 d \left (b \sec \left (d x +c \right )\right )^{\frac {7}{2}}}+\frac {14 b^{3} \sin \left (d x +c \right )}{45 d \left (b \sec \left (d x +c \right )\right )^{\frac {3}{2}}}+\frac {14 b^{2} \sqrt {\frac {\cos \left (d x +c \right )}{2}+\frac {1}{2}}\, \EllipticE \left (\sin \left (\frac {d x}{2}+\frac {c}{2}\right ), \sqrt {2}\right )}{15 \cos \left (\frac {d x}{2}+\frac {c}{2}\right ) d \sqrt {\cos \left (d x +c \right )}\, \sqrt {b \sec \left (d x +c \right )}} \]
command
integrate(cos(d*x+c)^6*(b*sec(d*x+c))^(3/2),x, algorithm="fricas")
Fricas 1.3.8 (sbcl 2.2.11.debian) via sagemath 9.6 output
\[ \frac {21 i \, \sqrt {2} b^{\frac {3}{2}} {\rm weierstrassZeta}\left (-4, 0, {\rm weierstrassPInverse}\left (-4, 0, \cos \left (d x + c\right ) + i \, \sin \left (d x + c\right )\right )\right ) - 21 i \, \sqrt {2} b^{\frac {3}{2}} {\rm weierstrassZeta}\left (-4, 0, {\rm weierstrassPInverse}\left (-4, 0, \cos \left (d x + c\right ) - i \, \sin \left (d x + c\right )\right )\right ) + 2 \, {\left (5 \, b \cos \left (d x + c\right )^{4} + 7 \, b \cos \left (d x + c\right )^{2}\right )} \sqrt {\frac {b}{\cos \left (d x + c\right )}} \sin \left (d x + c\right )}{45 \, d} \]
Fricas 1.3.7 via sagemath 9.3 output
\[ {\rm integral}\left (\sqrt {b \sec \left (d x + c\right )} b \cos \left (d x + c\right )^{6} \sec \left (d x + c\right ), x\right ) \]