COSSection: Linux Programmer's Manual (3)
Index Return to Main Contents
NAMEcos, cosf, cosl - cosine function
#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)):
DESCRIPTIONThe cos() function returns the cosine of x, where x is given in radians.
RETURN VALUEOn success, these functions return the cosine of x.
If x is a NaN, a NaN is returned.
ERRORSSee 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
- An invalid floating-point exception (FE_INVALID) is raised.
CONFORMING TOC99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD.
SEE ALSOacos(3), asin(3), atan(3), atan2(3), ccos(3), sin(3), sincos(3), tan(3)
COLOPHONThis page is part of release 3.21 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.