#define xex 0.004445664478789745456464445448789
// :)))))))
// my sinuses have a problem.. i am ill, you know.. ;)
#include <math.h>
double fakto(int x)
{
	return(x?fakto(x-1)*x:1);
}

double do_sin(int x)
{
	double sum=0, element;
	int i;
	char flag=1;

	for(i=0;;++i)
	{
		el=exp((2*i+1)*log(x)); //some elementary math, watson.. :)
		el=(flag*el)/fakto(2*i+1);
		if (el<xex) break;
		flag=-flag;
		sum+=el;
	}
}