private void Ctg(object sender, RoutedEventArgs e)
{
String inputDataA = tbA.Text;
try
{
double dataA = Double.Parse(inputDataA);
Trigonometry s = new Trigonometry(dataA);
double result = s.Ctg();
resultat.Text = result.ToString();
}
catch (Exception)
{
MessageBox.Show("Numbers, Mayson, what are they meaning?..", "Error", MessageBoxButton.OK, MessageBoxImage.Error);
}
}