#include <iostream>
using namespace std;
int main()
{
    setlocale(LC_CTYPE, "Russian");
    double e = pow(10, (-6)), k = 1, fact, x, sum = 1, slog = 1;
    int i;
    cout << "Введите x, 0<x<=1: ";
    cin >> x;
    do
    {
        fact = 1;
        for (i = 1; i <= k; i++)
        {
            fact *= i;
        }
        slog = (pow(-1, k)*pow(x, 2 * k)) / fact;
        sum += slog;
        k++;
    } while (abs(slog) > e);
    cout << "\nКоличество слагаемых: " << k << "\nСумма = " << sum << "\n\n";
    system("pause");
    return 0;
}