TSP ne raboti math

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication2
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        void calc()
        {
            double a, b, c;
            a = double.Parse(textBox1.Text);
            b = double.Parse(textBox2.Text);
            c = double.Parse(textBox3.Text);
            if (radioButton1.Checked)
            {
                c = Math.Pow(a, 2) + Math.Pow(b, 2);
            }

            if (radioButton2.Checked)
            {
                c = Math.Pow(a, 2) - Math.Pow(b, 2);
            }


        }

        private void Form2_Load(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            calc();
        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {
            calc();
        }

        private void textBox3_TextChanged(object sender, EventArgs e)
        {
            calc();
        }

        private void radioButton1_CheckedChanged(object sender, EventArgs e)
        {
             calc();
        }

        private void radioButton2_CheckedChanged(object sender, EventArgs e)
        {
            calc();
        }
    }
}