#include<iostream>
#include<cstdio>
#include<cmath>
using namespace std;
const double PI = 3.1415926535;
class angle{
private:
	int num;
public:
	angle(){}
	angle(int x):num(x){}
	void setnum(int x){
		num = x;
	}
	int getnum(){
		return num;
	}
	~angle(){}
	angle operator-(angle a);
	double xsin();
};
angle angle::operator-(angle a)
{
	return angle(num-a.num);
}
double angle::xsin()
{
	double x = PI*num/180;
	return sin(x);
}
int main()
{
	int m;
	cin >> m;
	while (m--) {
		int num;
		angle a, b;
		cin >> num;
		a.setnum(num);
		cin >> num;
		b.setnum(num);
		angle c = a - b;
		printf("%.2f\n", c.xsin());
	}
	return 0;
}