acosh()

NAME

acosh() - inverse hyperbolic cosine function

SYNOPSIS

#include <math.h>


double acosh (double x)

DESCRIPTION

The acosh(3) function computes the inverse hyperbolic cosine of the real argument x. For a discussion of error due to roundoff, see math(1).

RETURN VALUES

The acosh(3) function returns the inverse hyperbolic cosine of x.

ERRORS

The acosh(3) function fails and sets errno for these reasons:

[EDOM]

The value of x is less than 1.0.

SEE ALSO

asinh(3)

atanh(3)

exp(3)

infnan(3)

math(3)