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. 

DIAGNOSTICS

acosh returns the NAN (Not A Number) on a NEWS if the argument is less than 1. 

atanh returns the NAN (Not A Number) on a NEWS if the argument has absolute value bigger than or equal to 1. 

SEE ALSO

math(3M), exp(3M), mathtrap(3). 

AUTHOR

W. Kahan, Kwok−Choi Ng

NEWS-OSRelease 4.2.1R