NAME

asinh, acosh, atanh − inverse hyperbolic functions

SYNOPSIS

#include <math.h>

double asinh(x)
double x;

double acosh(x)
double x;

double atanh(x)
double x;

DESCRIPTION

These functions compute the designated inverse hyperbolic functions for real arguments.  They inherit much of their (roundoff, etc.) error from log1p, as described in exp(3M).

SEE ALSO

intro(3M), exp(3M)

DIAGNOSTICS

Acosh returns a NaN if the argument is less than 1. 

Atanh returns a NaN if the argument has absolute value greater than 1. 

Sun Release 3.5  —  Last change: 14 March 1986