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ACOSH
Section: Linux Programmer's Manual (3)
Updated: 2007-07-26
Index
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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);
Link with -lm.
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
acosh(),
acoshf(),
acoshl():
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or
cc -std=c99
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
SVr4, POSIX.1-2001, 4.3BSD, C89.
The
float
and
long double
variants are C99 requirements.
SEE ALSO
asinh(3),
atanh(3),
cacosh(3),
cosh(3),
sinh(3),
tanh(3)
COLOPHON
This page is part of release 3.05 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- ERRORS
-
- CONFORMING TO
-
- SEE ALSO
-
- COLOPHON
-
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