NAME
cos,
cosf —
cosine
function
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
double
cos(
double
x);
float
cosf(
float
x);
DESCRIPTION
The
cos() and
cosf() 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”).