lab3_n2beta4

#include<math.h>
#include<iostream>
#define pi acos(-1.0)
using namespace std;
int main()
{
    setlocale(LC_ALL, "RUS");
    double x, b, h, a, y, i, s0, s1, e, p;
    e = 1.4e-1;
    b = pi;
    h = pi / 25;
    a = pi / 5;
    i = 1;
    x = a;
    s0 = (pow(-1, i) * cos(i * x)) / (i * i);
    s1 = (pow(-1, (i + 1)) * cos((i + 1) * (x + h))) / ((i + 1) * (i + 1));
    for (x = a; x <= b; x = x + h)
    {
        i++;
        if (fabs(s1 - s0) > e)
        {
            s0 += (pow(-1, i) * cos(i * x)) / (i * i); cout << "s0=" << s0<<"\n";
            s1 += (pow(-1, i) * cos(i * x)) / (i * i); cout << "s1=" << s1<<"\n";
            y = ((x * x) - ((pi * pi) / 3));
            p = fabs(s0 - y);
            cout << "p=" << p << "\n";
            cout << "e=" << e << "\n";
        }
        else
        {
            break;
        }
    }
    cout << "Сумма равна" << s0;
    return 0;
}