#include <stdio.h>
#include <math.h>

int main()
{

	printf("The cosine of %f is %f.\n",0.5,cos(0.5));
	printf("The cosine of %f is %f.\n",1.0,cos(1.0));
	printf("The cosine of %f is %f.\n",-1.0,cos(-1.0));
	return 0;
}