NAME

     cos - cosine function

SYNOPSIS

     #include <math.h>

     double cos(double x);

DESCRIPTION

     The cos() function returns the cosine of x, where x is given
     in radians.

RETURN VALUE

     The cos() function returns a value between -1 and 1.

CONFORMING TO

     SVID 3, POSIX, BSD 4.3, ISO 9899

SEE ALSO

     acos(3), asin(3), atan(3),