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 = a+b;
            //=================================================================
            // Шаг 2
            double x0 = 1 / (2 * L) * (foo(a) - foo(b) + L);
            double y0 = 1 / 2 * (foo(a) - foo(b) + (a-b));
            double phimin = y0;
            // Шаг 3
            double delta = 1 / (2 * L) * (foo(x0) - phimin);

            // Шаг 4


                if (2 * (b-a)* delta < masheps)
                {
                    Console.WriteLine(delta);
                    Console.WriteLine(x0);

                }

            //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();

        }
    }
}