NAME

asinh, acosh, atanh − inverse hyperbolic functions

SYNTAX

#include <math.h>

double asinh(x)
double x;

double acosh(x)
double x;

double atanh(x)
double x;

DESCRIPTION

The asinh, acosh, and atanh functions compute the designated inverse hyperbolic functions for real arguments.

DIAGNOSTICS

The acosh function returns the default quiet NaN if the argument is less than one. 

The atanh function returns the default quiet NaN if the argument has an absolute value greater than or equal to one. 

ERROR (for example, because of roundoff)

These functions inherit much of their error from the log1p() function.

SEE ALSO

exp(3m), math(3m)

Subroutines