@stdlib/math-base-special-fast-atanh (npm): Compute the hyperbolic arctangent of a number.
Keywords: stdlib|stdfastmath|mathematics|math|fastmath|fast|math.atanh|atanh|hyperbolic|inverse|tangent|tan|trig|trigonometry|radians|angle|polyfill|ponyfill|javascript|node|node-js|nodejs