COS
Section: Linux Programmer's Manual (3)
Updated: 20100911
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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 floatingpoint exception
(FE_INVALID)
is raised.
CONFORMING TO
C99, POSIX.12001.
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)
COLOPHON
This page is part of release 3.54 of the Linux
manpages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/manpages/.
Index
 NAME

 SYNOPSIS

 DESCRIPTION

 RETURN VALUE

 ERRORS

 CONFORMING TO

 BUGS

 SEE ALSO

 COLOPHON

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Time: 02:07:49 GMT, January 18, 2018