Inverse Hyperbolic Secant function plot (Arc hyperbolic secant, arcsech)
arsech(x) = ln((1 + sqrt(1 - x^2)) / x)
Plotted with cubic bezier-curves. The bezier-controll-points are calculated to give a very accurate result.
Asymptotes are included but commented out.

Symbols are embeded in "Computer Modern" (TeX) font.
Own work
Geek3