Начертить график цепной линии

{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{//построить график функции y=(A•(e^(x/2)+e^(-x/2)))/2.
//рисуем оси
Graphics g = panel1.CreateGraphics();
g.Clear(Color.White);
int ox, oy;
ox = panel1.Width / 2;
oy = panel1.Height / 2;
Pen p1 = new Pen(Color.Blue, 1);
p1.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;
Graphics r = panel1.CreateGraphics();
r.DrawLine(p1, 0, oy, 2 * ox, oy);
r.DrawLine(p1, ox, 2 * oy, ox, 0);
//подписи к осям
Font F=new Font("Couveir new",9,FontStyle.Bold);
SolidBrush n=new SolidBrush (Color.Purple);
g.DrawString("x",F,n,panel1.Width-9,panel1.Height/2);
g.DrawString("y",F,n,panel1.Width/2,0);
 
int A;
A=Convert.ToInt32(numericUpDown1.Value);
Pen p2=new Pen(Color.Black,1);
double h=0.1,x ;//шаг
int k=10; 
for(x=-10;x<=10;x=x+h)
{
float y=oy+k*(float)((A/2)*(Math.Exp(x/2))+Math.Exp(-x/2)));
float y1=oy+k*(float)((A/2)*(Math.Exp(x/2))+Math.Exp(-x/2)));
g.DrawLine(p2,0,y,0,y1);
}
} 
}
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
 
namespace WindowsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
//оси координат
Graphics g = panel1.CreateGraphics();
g.Clear(Color.White);
 
int ox = panel1.Width / 2;
int oy = panel1.Height / 2;
Pen p1 = new Pen(Color.Blue, 1);
p1.EndCap = System.Drawing.Drawing2D.LineCap.ArrowAnchor;
Graphics r = panel1.CreateGraphics();
r.DrawLine(p1, 0, oy, 2 * ox, oy);
r.DrawLine(p1, ox, 2 * oy, ox, 0);
//подпись по осям
Font F=new Font("Couveir new",9,FontStyle.Bold);
SolidBrush n=new SolidBrush (Color.Purple);
g.DrawString("x",F,n,panel1.Width-9,panel1.Height/2);
g.DrawString("y",F,n,panel1.Width/2,0);
 
int A = Convert.ToInt32(numericUpDown1.Value);
Pen p2 = new Pen(Color.Black,1);
float h = 0.001F;//шаг
 
int k=1;
for (float x = -20; x <= 20; x = x + h)
{
float y = oy + k * (float)((A * (Math.Exp(x / 2)) + Math.Exp(-x / 2)) / 2);
float y1 = oy + k * (float)((A * (Math.Exp((x + h) / 2)) + Math.Exp(-(x + h) / 2)) / 2);
g.DrawLine(p2, x+ox, y, x+h+ox, y1);
}
}
}
}