private void button1_Click(object sender, EventArgs e)
{
Polinom p = new Polinom(textBox1.Text);
textBox2.Text = "f(x) = " + p.print(p.polinom);
textBox3.Text = "f'(x) = " + p.print(p.der);
textBox4.Text = string.Join(" ", p.der);
}
