d2

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

using namespace std;

int n;

double f1(double x) {

    return (1 + x * x) / 2 * atan(x) - (x / 2);
}

double f2(double x) {
    double S = 0;
    double E = -1;
    for (int k = 1; k <= n; k++)
    {
        E *= (-1) * x * x;
        S = S + E * x / (4 * k * k - 1);
    }
    return S;

}
int main() {
    system("chcp 1251>nul");
    double a, b, h,E;
    double S;
    double x;
    cout << "Введите a,b,h,n\n";
    cin >> a >> b >> h >> n;
    cout << setw(30) << "Y" << setw(15) << "S" << setw(15) << "|S-Y|" << endl;
    for (x = a; x <= b; x += h)
    {

        f1(x);
        f2(x);
        cout << setw(30) << f1(x) << setw(15) << f2(x) << setw(15) << fabs(f2(x)- f1(x)) << endl;
    }
    system("pause>nul");
}