\[ \int \frac {(a+i a \tan (c+d x))^3 (A+B \tan (c+d x))}{\tan ^{\frac {9}{2}}(c+d x)} \, dx \]
Optimal antiderivative \[ -\frac {8 \left (-1\right )^{\frac {1}{4}} a^{3} \left (-i B +A \right ) \arctan \left (\left (-1\right )^{\frac {3}{4}} \left (\sqrt {\tan }\left (d x +c \right )\right )\right )}{d}+\frac {8 a^{3} \left (i A +B \right )}{d \sqrt {\tan \left (d x +c \right )}}+\frac {8 a^{3} \left (-21 i B +23 A \right )}{105 d \tan \left (d x +c \right )^{\frac {3}{2}}}-\frac {2 a A \left (a +i a \tan \left (d x +c \right )\right )^{2}}{7 d \tan \left (d x +c \right )^{\frac {7}{2}}}-\frac {2 \left (11 i A +7 B \right ) \left (a^{3}+i a^{3} \tan \left (d x +c \right )\right )}{35 d \tan \left (d x +c \right )^{\frac {5}{2}}} \]
command
integrate((a+I*a*tan(d*x+c))^3*(A+B*tan(d*x+c))/tan(d*x+c)^(9/2),x, algorithm="giac")
Giac 1.9.0-11 via sagemath 9.6 output
\[ \frac {\left (4 i - 4\right ) \, \sqrt {2} {\left (-i \, A a^{3} - B a^{3}\right )} \arctan \left (-\left (\frac {1}{2} i - \frac {1}{2}\right ) \, \sqrt {2} \sqrt {\tan \left (d x + c\right )}\right )}{d} - \frac {2 \, {\left (-420 i \, A a^{3} \tan \left (d x + c\right )^{3} - 420 \, B a^{3} \tan \left (d x + c\right )^{3} - 140 \, A a^{3} \tan \left (d x + c\right )^{2} + 105 i \, B a^{3} \tan \left (d x + c\right )^{2} + 63 i \, A a^{3} \tan \left (d x + c\right ) + 21 \, B a^{3} \tan \left (d x + c\right ) + 15 \, A a^{3}\right )}}{105 \, d \tan \left (d x + c\right )^{\frac {7}{2}}} \]
Giac 1.7.0 via sagemath 9.3 output
\[ \int \frac {{\left (B \tan \left (d x + c\right ) + A\right )} {\left (i \, a \tan \left (d x + c\right ) + a\right )}^{3}}{\tan \left (d x + c\right )^{\frac {9}{2}}}\,{d x} \]________________________________________________________________________________________