#include <iostream>
#include <cmath>
using namespace std;

double tn(int,double);
int main(){
	double eps, x1 = 1.1, x2 = 3.1, dx;


	cout << "Enter eps, dx:";
	cin >> eps >> dx;
	for (double x = x1; x <= x2; x = x + dx){
		double f = 1.57;int n = 0;
		while (abs(tn(n,x))>=eps) {
			f += tn(n,x);
			n++;
		}
		cout << x  << "\t" << atan(x) << "\t" << "F(" << x << ")=" << f<< endl;
	}
	system("pause");
	return 0;
}

double tn(int n1,double x1){
	return pow((-1.0),(n1+1))/((2*n1+1)*pow(x1,2*n1+1));
}