table of contents
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);
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 attributes(7).
Interface | Attribute | Value |
cos (), cosf (), cosl () | Thread safety | MT-Safe |
STANDARDS¶
C11, POSIX.1-2008.
HISTORY¶
C89, POSIX.1-2001.
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)
2023-03-30 | Linux man-pages 6.04 |