Rational Developer for System z
Enterprise PL/I for z/OS, Version 3.8, Language Reference Manual

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 diagram>>-ATANH(x)----------------------------------------------------><
 
x
Expression. ABS(x)<1.

The result has a value given by:

  LOG((1 + x)/(1 - x))/2

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