NAME
cos, cosf, cosl - cosine function SYNOPSIS
#include
double cos(double x); float cosf(float x); long double cosl(long double x); Link with -lm. Feature Test Macro Requirements for glibc (see featuretestmacros(7)): cosf(), cosl(): BSDSOURCE || SVIDSOURCE || XOPENSOURCE >= 600 || ISOC99SOURCE || POSIXCSOURCE >= 200112L;
or cc -std=c99 DESCRIPTION The cos() function returns the cosine of x, where x is given in radi‐ ans. 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 matherror(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 (FEINVALID) 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 │ └──────────────────────┴───────────────┴─────────┘ CONFORMING TO
C99, POSIX.1-2001. The variant returning double also conforms to SVr4, 4.3BSD. BUGS Before version 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) COLOPHON
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2010-09-11 COS(3)