NAME
cos, cosf,
cosl —
cosine function
LIBRARY
library “libm”
SYNOPSIS
#include
<math.h>
double
cos(double
x);
float
cosf(float
x);
long double
cosl(long
double x);
DESCRIPTION
Thecos(),
cosf(),
and
cosl()
functions compute the cosine of x (measured in radians).
A large magnitude argument may yield a result with little or no significance.
For a discussion of error due to roundoff, see
math(3).
RETURN VALUES
The cos() function returns the cosine
value.
SEE ALSO
acos(3), asin(3), atan(3), atan2(3), cosh(3), math(3), sin(3), sinh(3), tan(3), tanh(3)
STANDARDS
The cos() function conforms to
ANSI X3.159-1989
(“ANSI C89”).
HISTORY
A cos() function appeared in
Version 1 AT&T UNIX.