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 P1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

        }
        double delta,x1,x2;
        double rezultat;
        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (checkBox1.Checked)
            {
                int s1 = Convert.ToInt32(textBox1.Text);
                int s2 = Convert.ToInt32(textBox2.Text);
                int s3 = Convert.ToInt32(textBox5.Text);
                delta = s2 * s2 - 4 * s1 * s3;
                if (delta > 0)
                {
                    x1 = ((-s2) + Math.Sqrt(delta)) / (2.0 * s1);
                    x1 = ((-s2) - Math.Sqrt(delta)) / (2.0 * s1);
                }
                if (delta == 0)
                {
                    x1 = -s2 / (2.0 * s1);
                    x2 = -s2 / (2.0 * s1);
                }
                if (delta <0)
                {
                    x1 = -s2 / (2.0 * s1);
                    x2 = Math.Sqrt(-delta) / (2.0 * s1);
                }
                textBox6.Text = "x1= " + Convert.ToString(x1) + ";  x2= " + Convert.ToString(x2);
            }
            if(checkBox2.Checked)
            {
                string functie = listBox1.Text;
                if (functie == "sin(x)")
                    rezultat = Math.Asin(Convert.ToDouble(textBox7.Text));
                if (functie == "cos(x)")
                    rezultat = Math.Acos(Convert.ToDouble(textBox7.Text));
                if (functie == "tg(x)")
                    rezultat = Math.Atan(Convert.ToDouble(textBox7.Text));
                if (functie == "ctg(x)")
                    rezultat = 1/Math.Atan(Convert.ToDouble(textBox7.Text));
                textBox6.Text = rezultat.ToString();
            }
        }
    }
}