cos(3) Library Functions Manual cos(3)
NAME
cos, cosf, cosl - cosine function
LIBRARY
Math library (libm, -lm)
SYNOPSIS
#include <math.h>
double cos(double x);
float cosf(float x);
long double cosl(long double x);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
cosf(), cosl():
_ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
DESCRIPTION
These functions return 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
For an explanation of the terms used in this section, see at-
tributes(7).
┌────────────────────────────────────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├────────────────────────────────────────────┼───────────────┼─────────┤
│cos(), cosf(), cosl() │ Thread safety │ MT-Safe │
└────────────────────────────────────────────┴───────────────┴─────────┘
STANDARDS
C99, POSIX.1-2001, POSIX.1-2008.
The variant returning double also conforms to SVr4, 4.3BSD.
BUGS
Before glibc 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)
Linux man-pages 6.03 2023-02-05 cos(3)
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