acosh
Hurricane Electric Internet Services
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)
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Hurricane Electric.
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