Primitive of Square of Secant of a x over Tangent of a x

Theorem

 * $\displaystyle \int \frac {\sec^2 a x \ \mathrm d x} {\tan a x} = \frac 1 a \ln \left\vert{\tan a x}\right\vert + C$

Also see

 * Primitive of $\dfrac {\csc^2 a x } {\cot a x}$