Primitive of Inverse Hyperbolic Secant of x over a/Corollary

Theorem

 * $\ds \int \sech^{-1} \frac x a \rd x = -x \paren {-\sech^{-1} \dfrac x a} - a \arcsin \dfrac x a + C$

where $-\sech^{-1}$ denotes the negative branch of the real inverse hyperbolic secant multifunction.