using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LAB_3_CH
{
    class Задание
    {
        static void Main(string[] args)
        {
            int n = 15;
            double a = 0.1, b = 1, k = 10;
            double periodx = ((b - a) / k);
            double e = 0.0001;
            double x = 0.1;
            Console.WriteLine("0,1 <= x <= 1   n = 15");
            Console.WriteLine("   ");
            while(x <= b)
            {
                double sn = (Math.Pow(-1, 1) * (Math.Pow((2 * x), 2))) / 2,
                    res = 1,
                    se = (Math.Pow(-1, 1) * (Math.Pow((2 * x), 2))) / 2;
                double y = 2 * (Math.Pow(Math.Cos(x), 2) - 1);
                for (int period1 = 1; period1 <= n; period1++)
                {
                    int fact = 1;
                    for (int i = 1; i <= period1; i++)
                    {
                        fact *= i;
                    }
                    res = (Math.Pow(-1, period1)*(Math.Pow((2 * x), (2 * period1)))) / (2 * fact);
                    sn += res;

                }
                int period2 = 1;
                do
                {
                    int fact = 1;
                    for (int i = 1; i <= period2; i++)
                    {
                        fact *= i;
                    }
                    res = (Math.Pow(-1, period2) * (Math.Pow((2 * x), (2 * period2)))) / (2 * fact);

                    se += res;
                    period2++;
                }
                while (res >= e);
                Console.WriteLine("X={0:000000000000}  SN={1:00000}  SE={2:00000}  Y={3:00000}", x, sn, se, y);
                x += periodx;
            }
            Console.ReadKey();
        }
    }
}