double cos (double x);
double cos (double x); float cosf (float x);long double cosl (long double x);
double cos (double x); float cos (float x);long double cos (long double x);
double cos (double x); float cos (float x);long double cos (long double x); double cos (T x); // additional overloads for integral types
<cmath> ) for the integral types: These overloads effectively cast x to a double before calculations (defined for T being any integral type ).<complex> and <valarray> (see complex cos and valarray cos).180/PI degrees.1
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/* cos example */
#include <stdio.h> /* printf */
#include <math.h> /* cos */
#define PI 3.14159265
int main ()
{
double param, result;
param = 60.0;
result = cos ( param * PI / 180.0 );
printf ("The cosine of %f degrees is %f.\n", param, result );
return 0;
}The cosine of 60.000000 degrees is 0.500000.