cos, cosf, cosl - cosine function
double cos(double x);
float cosf(float x);
long double cosl(long double x);
Link with -lm.
_POSIX_C_SOURCE >= 200112L
|| /* Since glibc 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
These functions return the cosine of x, where x is given in
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:
For an explanation of the terms used in this section, see attributes(7).
- Domain error: x is an infinity
- errno is set to EDOM (but see BUGS). An invalid
floating-point exception (FE_INVALID) is raised.
C99, POSIX.1-2001, POSIX.1-2008.
|cos (), cosf (), cosl ()
The variant returning double also conforms to SVr4,
Before version 2.10, the glibc implementation did not set errno to
EDOM when a domain error occurred.
This page is part of release 5.10 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the latest
version of this page, can be found at https://www.kernel.org/doc/man-pages/.