ATANH(3) BSD Library Functions Manual ATANH(3)

NAME
     aattaannhh - inverse hyperbolic tangent function

SYNOPSIS
     ##iinncclluuddee <>

     double
     aattaannhh(double x);

     long double
     aattaannhhll(long double x);

     float
     aattaannhhff(float x);

DESCRIPTION
     The aattaannhh() function computes the inverse hyperbolic tangent of the real
     argument x.

SSPPEECCIIAALL VVAALLUUEESS
     aattaannhh(+-0) returns +-0.

     aattaannhh(+-1) returns +-infinity and raises the "divide-by-zero" floating-
     point exception.

     aattaannhh(x) returns a NaN and raises the "invalid" floating-point exception
     for |x| > 1.

SEE ALSO
     acosh(3), asinh(3), exp(3), math(3)

STANDARDS     The aattaannhh() function conforms to ISO/IEC 9899:1999(E).

4.3 Berkeley Distribution      November 20, 2002     4.3 Berkeley Distribution