using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace ConsoleApp2

{

    internal class Program

    {

        static void Main(string[] args)

        {

            double xMin = 0;

            double xMax = 40;

            double step = 0.1;

​

            double a = 4.5;

            double b = 8.4;

            for (double x = xMin; x < xMax; x = x + step)

            {

                double y;

                var z = Math.Tan(b * x * x);

                if (x <= a)

                {

                    y = a * Math.Pow(Math.Cos(x), 2) + b * Math.Sin(z * x);

                }

                else if (x <= 4.5 * b)

                {

                    y = Math.Atan(a * x + z) + Math.Pow(Math.Sin(b * x), 2);

                }

                else

                {

                    y = Math.Log(a * x - b) + z * z;

                }

​

                Console.WriteLine(Math.Round(x, 1) + ":\t" + y);

            }

        }

    }

}

​