Primitive of Inverse Hyperbolic Secant of x over a over x

Theorem

 * $\displaystyle \int \frac {\operatorname{sech}^{-1} \dfrac x a \ \mathrm d x} x = \begin{cases}

\displaystyle - \frac {\ln \left({\dfrac a x}\right) \ln \left({\dfrac {4 a} x}\right)} 2 - \sum_{k \mathop \ge 0} \frac {\left({2 k + 1}\right)!} {2^{2 k} \left({k!}\right)^2 \left({2 k + 1}\right)^3 \left({2 k}\right)^2} \left({\frac x a}\right)^{2 k} + C & : \operatorname{sech}^{-1} \dfrac x a > 0 \\ \displaystyle \frac {\ln \left({\dfrac a x}\right) \ln \left({\dfrac {4 a} x}\right)} 2 + \sum_{k \mathop \ge 0} \frac {\left({2 k + 1}\right)!} {2^{2 k} \left({k!}\right)^2 \left({2 k + 1}\right)^3 \left({2 k}\right)^2} \left({\frac x a}\right)^{2 k} + C & : \operatorname{sech}^{-1} \dfrac x a < 0 \\ \end{cases}$

Also see

 * Primitive of $\dfrac {\sinh^{-1} \frac x a} x$


 * Primitive of $\dfrac {\cosh^{-1} \frac x a} x$


 * Primitive of $\dfrac {\tanh^{-1} \frac x a} x$


 * Primitive of $\dfrac {\coth^{-1} \frac x a} x$


 * Primitive of $\dfrac {\operatorname{csch}^{-1} \frac x a} x$