ACOSH(3) OpenBSD Programmer's Manual ACOSH(3)NAME
acosh, acoshf - inverse hyperbolic cosine functions
SYNOPSIS
#include <math.h>
double
acosh(double x);
float
acoshf(float x);
DESCRIPTION
The acosh() function computes the inverse hyperbolic cosine of the real
argument x. The acoshf() function is a single precision version of
acosh().
RETURN VALUES
If x is less than one, acosh(x) and acoshf(x) return NaN and set the
global variable errno to EDOM.
SEE ALSOasinh(3), atanh(3), exp(3), infnan(3), math(3)HISTORY
The acosh() function appeared in 4.3BSD.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9