Primitive of Square of Secant of a x

Theorem

 * $\displaystyle \int \sec^2 a x \ \mathrm d x = \frac {\tan a x} a + C$

Also see

 * Primitive of $\sin^2 a x$
 * Primitive of $\cos^2 a x$
 * Primitive of $\tan^2 a x$
 * Primitive of $\cot^2 a x$
 * Primitive of $\csc^2 a x$