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

namespace Posloupnost_Eurerovo_číslo
{
    class Program
    {
        static void Main(string[] args)
        {
            double x, e, cosx, an;
            int n, P;
            Console.Write("Zadejte presnost na pocet desetinnych mist: ");
            P = int.Parse(Console.ReadLine());
            e = 1f;
            for (int i = 0; i <= P; i++)
            {
                e = e / 10;
            }
            cosx = 0;
            n = 0;

            Console.Write("Pro vypocet sinus(x) zadej ve stupních: ");
            x = int.Parse(Console.ReadLine());
            x = ((x * Math.PI) / 180);
            an = 1;

            while (Math.Abs(an) > e)
            {
                cosx = cosx + an;
                n++; // n zvýšíme o jedničku
                an = -an * x * x / ((2 * n) * (2 * n - 1)); //vypočteme nove an
            }
            if (cosx < 0.00000001)
                cosx = 0;
            Console.WriteLine("cos X = " + cosx);
            Console.ReadLine();





        }
    }
}