using System;
using System.Numerics;

public class Test
{
    static float LinearFormula(float x, Vector2 a, Vector2 b)
    {
        float slope = (b.Y - a.Y) / (b.X - a.X);
        float dx = x - a.X;
        float dy = slope * dx; 
        return dy + a.Y;
    }

    static float CossineFormula(float x)
    {
        return Math.Abs(x) - (float) Math.Cos(x * 3);
    }

    static float MyFormula(float x, Vector2 a, Vector2 b)
    {
        return CossineFormula(x) - LinearFormula(x, a, b);
    }

    static Vector2 FindIntersection(Vector2 a, Vector2 b)
    {
        float x1 = 2;
        float x2 = 3;

        for (int i = 0; i < 100; i++)
        {
            float d = (x2 + x1) / 2;
            if (d == x1 || d == x2) break;
            float v3 = MyFormula(d, a, b);
            if (v3 > 0)
            {
                x2 = d;
            }
            else
            {
                x1 = d;
            }
        }
        return new Vector2(x1, CossineFormula(x1));
    }

    public static void Main()
    {
        Console.WriteLine(FindIntersection(new Vector2(0, 4), new Vector2(1, 3)));
    }
}