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acosh(3) -- Linux man page
NAME
acosh, acoshf, acoshl - inverse hyperbolic cosine function
SYNOPSIS
#include <math.h>
double acosh(double x);
float acoshf(float x);
long double acoshl(long 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.
The float and long double variants are C99 requirements.
SEE ALSO
asinh(3),
atanh(3),
cosh(3),
sinh(3),
tanh(3)
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