cosf(3) · carta

Usage

double cos(double x); float cosf(float x); long double cosl(long double x);

_ISOC99_SOURCE { | | _POSIX_C_SOURCE >= 200112L}

Math library (libm, -lm)

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

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:

Domain error: x is an infinity: errno is set to EDOM (but see BUGS). An invalid floating-point exception (FE_INVALID) is raised.

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
cos(), cosf(), cosl()	Thread safety	MT-Safe