lab3 otpravit

#define _USE_MATH_DEFINES
#include<math.h>
#include<iostream>
#include <stdio.h>
using namespace std;
int main()
{
    setlocale(LC_ALL, "RUS");
    double x, b, h, a, y, i, s0, s1, e, s;
    e = 0.0001;
    b = M_PI;
    h = M_PI / 25;
    a = M_PI / 5;
    for (x = a; x <= b; x = x + h)
    {
        s = 0;
        i = 1;
        s0 = pow(-1, i) * cos(i * x) / (i * i);
        do
        {
            s1 = s0;
            s = s + s1;
            i++;
            s0 = (pow(-1, i) * cos(i * x)) / (i * i);
        } while (fabs(s0 - s1) >= e);
        y = (x * x - M_PI * M_PI / 3) * 0.25;
        cout << "sum=" << s << "     " << "y=" << y << "\n";
    }
    return 0;
}