Trigonometry Function in c# WPF application

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<Window x:Class="Trigonometry.MainWindow"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        Title="MainWindow" Height="350" Width="525">

    <Grid>

        <TextBox Height="33" HorizontalAlignment="Left" Margin="174,90,0,0" Name="inputDisplay" VerticalAlignment="Top" Width="156" />

        <Button Content="Cos (" Height="23" HorizontalAlignment="Left" Margin="174,129,0,0" Name="cosBTN" VerticalAlignment="Top" Width="75" Click="cosBTN_Click" />

        <Button Content="Sin (" Height="23" HorizontalAlignment="Left" Margin="255,129,0,0" Name="sinBTN" VerticalAlignment="Top" Width="75" Click="sinBTN_Click" />

        <Button Content="Tan (" HorizontalAlignment="Left" Margin="174,158,0,0" Name="tanBTN" Width="75" Height="23" VerticalAlignment="Top" Click="tanBTN_Click" />

        <Button Content="Cot (" Height="23" HorizontalAlignment="Left" Margin="255,158,0,0" Name="cotBTN" VerticalAlignment="Top" Width="75" Click="cotBTN_Click" />

        <Button Content="Sec (" Height="23" HorizontalAlignment="Left" Margin="255,187,0,0" Name="secBTN" VerticalAlignment="Top" Width="75" Click="secBTN_Click" />

        <Button Content="Cosec (" Height="23" HorizontalAlignment="Left" Margin="174,187,0,0" Name="cosecBTN" VerticalAlignment="Top" Width="75" Click="cosecBTN_Click" />

        <Label Content="* Angle must be in radian" Foreground="Red" Height="28" HorizontalAlignment="Left" Margin="174,56,0,0" Name="label1" VerticalAlignment="Top" Width="156" />

    </Grid>

</Window>

namespace Trigonometry

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

        }

        private void cosBTN_Click(object sender, RoutedEventArgs e)

        {

            MessageBox.Show( "Cos("+inputDisplay.Text+") = "+Math.Cos(double.Parse(inputDisplay.Text)).ToString());

        }

        private void sinBTN_Click(object sender, RoutedEventArgs e)

        {

            MessageBox.Show("Sin(" + inputDisplay.Text + ") = " + Math.Sin(double.Parse(inputDisplay.Text)).ToString());

        

        }

        private void tanBTN_Click(object sender, RoutedEventArgs e)

        {

            MessageBox.Show("Tan(" + inputDisplay.Text + ") = " + Math.Tan(double.Parse(inputDisplay.Text)).ToString());

        

        }

        private void cotBTN_Click(object sender, RoutedEventArgs e)

        {

            double cot = 1/(Math.Tan(double.Parse(inputDisplay.Text)));

            MessageBox.Show("Cos(" + inputDisplay.Text + ") = " + cot.ToString());

        

        }

        private void cosecBTN_Click(object sender, RoutedEventArgs e)

        {

            double cosec = 1 / (Math.Sin(double.Parse(inputDisplay.Text)));

            MessageBox.Show("Cosec(" + inputDisplay.Text + ") = " + cosec.ToString());

        }

        private void secBTN_Click(object sender, RoutedEventArgs e)

        {

            double sec = 1 / (Math.Cos(double.Parse(inputDisplay.Text)));

            MessageBox.Show("Sec(" + inputDisplay.Text + ") = " + sec.ToString());

        }

    }

}