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

NAME
     atanh -- inverse hyperbolic tangent function

SYNOPSIS
     ##include <>

     double
     atanh(double x);

     long double
     atanhl(long double x);

     float
     atanhf(float x);

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

SPECIAL VALUES
     atanh(]-0) returns ]-0.

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

     atanh(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 atanh() function conforms to ISO/IEC 9899:1999(E).

4.3 Berkeley Distribution      November 20, 2002     4.3 Berkeley Distribution