ATANH

ATANH returns a floating-point value that has the base, mode, and precision of x, and is an approximation of the inverse (arc) hyperbolic tangent of x.

Read syntax diagramSkip visual syntax diagramATANH( x)
x
Expression. ABS(x)<1.
The result has a value given by: 
  LOG((1 + x)/(1 - x))/2