NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | BUGS | SEE ALSO |
|
|
cos(3) Library Functions Manual cos(3)
cos, cosf, cosl - cosine function
Math library (libm, -lm)
#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
These functions return the cosine of x, where x is given in radians.
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.
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.
For an explanation of the terms used in this section, see attributes(7). ┌──────────────────────────────────────┬───────────────┬─────────┐ │Interface │ Attribute │ Value │ ├──────────────────────────────────────┼───────────────┼─────────┤ │cos(), cosf(), cosl() │ Thread safety │ MT-Safe │ └──────────────────────────────────────┴───────────────┴─────────┘
C11, POSIX.1-2008.
C89, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD.
Before glibc 2.10, the glibc implementation did not set errno to EDOM when a domain error occurred.
acos(3), asin(3), atan(3), atan2(3), ccos(3), sin(3), sincos(3),
tan(3)
Linux man-pages 6.04 2023-03-30 cos(3)
Pages that refer to this page: acos(3), asin(3), atan2(3), atan(3), dlopen(3), sin(3), sincos(3), tan(3)