using System;

public class Program

{

    public static void Main()

    {

            double y, k1, k2, k3, k4;

            double x = 0.001, paso = 0.001;

            double V = 20;

            double[] A = new double[4] { 10, 30, 45, 90 };

            double b = 1;

            double VEL;

​

            y = 1;

            for (int i = 0; i < A.Length; i++)

            {

                VEL = V * Math.Sin(A[i]);

                k1 = (-9.81 / b) + ((9.81 / b) + (VEL)) * Math.Exp(-b * x);

                k2 = (-9.81 / b) + ((9.81 / b) + (VEL)) * Math.Exp(-b * (x + 0.5 * paso));

                k3 = (-9.81 / b) + ((9.81 / b) + (VEL)) * Math.Exp(-b * (x + 0.5 * paso));

                k4 = (-9.81 / b) + ((9.81 / b) + (VEL)) * Math.Exp(-b * (x + 0.5 * paso));

                y = y + (k1 + 2 * k2 + 2 * k3 + k4) * paso / 6;

                x = x + paso;

                Console.WriteLine("LOS DATOS QUE SE OBTUVIERON CUANDO EL ANGULO ES " + A[i]);

                Console.WriteLine("VALOR DE Y CUANDO X ES  " + x + " es " + y);

            }

            Console.ReadLine();

        }

    }