COS
Section: Linux Programmer's Manual (3)
Updated: 2013-10-14
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NAME
cos, cosf, cosl - cosine function
SYNOPSIS
#include <math.h>
double cos(double x);
float cosf(float x);
long double cosl(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
cosf(),
cosl():
-
_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE ||
_POSIX_C_SOURCE >= 200112L;
or
cc -std=c99
DESCRIPTION
The
cos()
function returns the cosine of
x,
where
x
is
given in radians.
RETURN VALUE
On success, these functions return the cosine of
x.
If
x
is a NaN, a NaN is returned.
If
x
is positive infinity or negative infinity,
a domain error occurs,
and a NaN is returned.
ERRORS
See
math_error(7)
for information on how to determine whether an error has occurred
when calling these functions.
The following errors can occur:
- Domain error: x is an infinity
-
errno
is set to
EDOM
(but see BUGS).
An invalid floating-point exception
(FE_INVALID)
is raised.
ATTRIBUTES
Multithreading (see pthreads(7))
The
cos(),
cosf(),
and
cosl()
functions are thread-safe.
CONFORMING TO
C99, POSIX.1-2001.
The variant returning
double
also conforms to
SVr4, 4.3BSD.
BUGS
Before version 2.10, the glibc implementation did not set
errno
to
EDOM
when a domain error occurred.
SEE ALSO
acos(3),
asin(3),
atan(3),
atan2(3),
ccos(3),
sin(3),
sincos(3),
tan(3)
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- ATTRIBUTES
-
- Multithreading (see pthreads(7))
-
- CONFORMING TO
-
- BUGS
-
- SEE ALSO
-
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Time: 02:55:17 GMT, September 18, 2014