#include<iostream.h>
#include<math.h>
#include<iomanip.h>

int sign(long double s)
{
	if(s>=0) 
		return 1;
	else 
		return -1;
}

long double ab(long double s)
{
	if(s<0)
		s=-s;
	return s;
}

void main()
{
	long double a=0.0,b=1.0,c=0.0000000000001,u=1.0,x,w;
	int k=0;
	do{
		x=(a+b)/2;
		w=cos(2*x)-9.0/4*x;
		cout<<k<<"\t"<<setprecision(10)<<x<<"\t"<<setprecision(10)<<w<<endl;
		k++;
		if(sign(w)!=sign(u))		
			b=x;
		else{
			a=x;
			u=w;
		}
	}while(ab(w)>=c);
}