LB1

private void button1_Click(object sender, EventArgs e)
        {
            chart1.Series[0].Points.Clear();
            chart1.Series[1].Points.Clear();
            chart1.Series[2].Points.Clear();
            richTextBox1.Clear();
            double y, z, w, x, A = Convert.ToDouble(textBox1.Text), B = Convert.ToDouble(textBox2.Text), h = Convert.ToDouble(textBox3.Text);
            bool ch1, ch2, ch3; ch1 = ch2 = ch3 = false;
            for (x = A; x <= B + 0.1 * h; x += h)
            {
                y = Math.Atan(x + 3.1); z = Math.Exp(x); w = 1.5 * Math.Cos(x - Math.PI / 4 * Math.Exp(x));
                ch1 = checkBox1.Checked;
                if (ch1) chart1.Series[0].Points.AddXY(x, y);
                ch2 = checkBox2.Checked;
                if (ch2) chart1.Series[1].Points.AddXY(x, z);
                ch3 = checkBox3.Checked;
                if (ch3) chart1.Series[2].Points.AddXY(x, w);

                richTextBox1.Text += " x = " + x.ToString("0.00");
                richTextBox1.Text += ((ch1) ? "  arctg(x + 3.1) = " +   y.ToString("0.00") : "");
                richTextBox1.Text += ((ch2) ? "  e^x = " +              z.ToString("0.00") : "");
                richTextBox1.Text += ((ch3) ? "  1.5cos(x - п/4*e^x) = " + w.ToString("0.##") : "");
                richTextBox1.Text += Environment.NewLine;
            }
            chart1.Series[0].IsVisibleInLegend = ch1;
            chart1.Series[1].IsVisibleInLegend = ch2;
            chart1.Series[2].IsVisibleInLegend = ch3;
        }