DragonFly On-Line Manual Pages

ATANH(3)              DragonFly Library Functions Manual              ATANH(3)

NAME
     atanh, atanhf, atanhl -- inverse hyperbolic tangent functions

SYNOPSIS
     #include <math.h>

     double
     atanh(double x);

     float
     atanhf(float x);

     long double
     atanhl(long double x);

DESCRIPTION
     The atanh() function computes the inverse hyperbolic tangent of the real
     argument x.  The atanhf() function is a single precision version of
     atanh().  The atanhl() function is an extended precision version of
     atanh().

RETURN VALUES
     If |x|>=1, atanh(x), atanhf(x) and atanhl(x) return +infinity, -infinity
     or NaN, and set the global variable errno to EDOM.

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

HISTORY
     The atanh() function appeared in 4.3BSD.

DragonFly 4.1                  November 3, 2013                  DragonFly 4.1