var13

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

namespace var13
{
    class Program
    {
        static void Main(string[] args)
        {
            double z1, z2, a, b;
            Console.Write("a = ");
            a = Convert.ToDouble(Console.ReadLine());
            Console.Write("b = ");
            b = Convert.ToDouble(Console.ReadLine());
            if ((Math.Cos(a) - Math.Sin(2*b - a) == 0) || (Math.Cos(2*b) == 0)) Console.WriteLine("Error!");
            else
            {
                z1 = (Math.Sin(a) + Math.Cos(2*b - a)) / (Math.Cos(a) - Math.Sin(2 * b - a));
                z2 = (1 + Math.Sin(2*b)) / (Math.Cos(2*b));
                Console.WriteLine("z1 = {0}\nz2 = {1}", z1, z2);
            }

            Console.ReadKey();
        }
    }
}