#include "stdafx.h"
#include <iostream>
#include <cmath>
using namespace std;
const double e=0.00005;


int _tmain(int argc, _TCHAR* argv[])
{
	float x,y;
	int n,j;
	cin>>n;
	for(int j=0;j<n;j++)
	{
		cin>>x;
		y=1;
		 while (fabs(y)>e)
		{
			y-=(y*(3*x*x-0,1*x+7)+((x-1)/(x*x-x+1))+(3*pow(cos(y),2)))/((3*x*x-0,1*x+7)-(3*sin(2*y)));
		}
		cout<<y<<endl;
	}
	system("pause");
}