cos - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03

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NAMEcos, cosf, cosl − cosine function

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LIBRARYMath library (libm, −lm)

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SYNOPSIS#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

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DESCRIPTIONThese functions return the cosine of x, where x is given in radians.

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RETURN VALUEOn 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.

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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  errno is set to EDOM (but see BUGS). An invalid floating-point exception (FE_INVALID) is raised.

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ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue cos(), cosf(), cosl() Thread safetyMT-Safe

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STANDARDSC99, POSIX.1-2001, POSIX.1-2008. The variant returning double also conforms to SVr4, 4.3BSD.

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BUGSBefore glibc 2.10, the glibc implementation did not set errno to EDOM when a domain error occurred.

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SEE ALSOacos(3), asin(3), atan(3), atan2(3), ccos(3), sin(3), sincos(3), tan(3) 0

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