ACOSH
Section: Linux Programmer's Manual (3)
Updated: June 13, 1993
NAME
acosh - inverse hyperbolic cosine function
SYNOPSIS
#include <math.h>
double acosh(double x);
DESCRIPTION
The acosh() function calculates the inverse hyperbolic cosine of
x; that is the value whose hyperbolic cosine is x. If x
is less than 1.0, acosh() returns not-a-number (NaN) and errno
is set.
ERRORS
- EDOM
-
x is out of range.
CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899
SEE ALSO
asinh(3), atanh(3), cosh(3), sinh(3), tanh(3)