using System;

namespace ConsoleApp6
{
    class Program
    {
        static double foo(double x)
        {
            return x * x - 2 * x - 2 * Math.Cos(x);
        }
        static void Main(string[] args)
        {
            double masheps = 1;
            while (1 + masheps > 1)
                masheps = masheps / 2;
            double a = -0.5;
            double b = 1;
            double L = b - a;
            //=================================================================
            // Шаг 2
            //  var x0 = (foo(a)-foo(b)+L*(a+b))/(2*L)
            double x0 = 1 / (2 * L) * (foo(a) - foo(b) + L * (a + b));
            double y0 = 1 / 2 * (foo(a) + foo(b) + L * (a - b));
            double phimin = y0;
            // Шаг 3
            double delta = 1 / (2 * L) * (foo(x0) - phimin);

            // Шаг 4




                if (2 * L * delta < masheps)
                {

                    Console.WriteLine($"х = {x0}");

                }
                else
                {
                    //шаг 5
                    double x1L = x0 - delta;
                    double x1R = x0 + delta;
                    double phi = 1 / 2 * (foo(x0) + phimin);
                    //шаг 6
                    if (foo(x1L) < foo(x1R))
                    {
                        x0 = x1L;
                        Console.WriteLine(x0);
                        Console.WriteLine("x1l");
                    }
                    else
                    {
                        x0 = x1R;
                        Console.WriteLine(x0);
                        Console.WriteLine("x1r");
                    }
                    y0 = phi;
                }



            Console.ReadKey();

        }
    }
}