cos(3M) Mathematical Library Functions cos(3M)NAME
cos, cosf, cosl - cosine function
SYNOPSIS
c99 [ flag... ] file... -lm [ library... ]
#include <math.h>
double cos(double x);
float cosf(float x);
long double cosl(long double x);
DESCRIPTION
These functions compute the cosine of x, measured in radians.
RETURN VALUES
Upon successful completion, these functions return the cosine of x.
If x is NaN, NaN is returned.
If x is +0, 1.0 is returned.
If x is ±Inf, a domain error occurs and a NaN is returned.
ERRORS
These functions will fail if:
Domain Error The x argument is ±Inf.
If the integer expression (math_errhandling &
MATH_ERREXCEPT) is non-zero, the invalid floating-point
exception is raised.
USAGE
An application wanting to check for exceptions should call feclearex‐
cept(FE_ALL_EXCEPT) before calling these functions. On return, if
fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is
non-zero, an exception has been raised. An application should either
examine the return value or check the floating point exception flags to
detect exceptions.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Standard │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │MT-Safe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOacos(3M), feclearexcept(3M), fetestexcept(3M), isnan(3M),
math.h(3HEAD), sin(3M), tan(3M), attributes(5), standards(5)SunOS 5.10 12 Jul 2006 cos(3M)