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The answer you go is correct. &nbsp;Cosine of 30 radians is 0.1542... &nbsp; Convert your number to Radians first<br />
<br />
1 Radian is 57.2958 degrees.
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The answer you go is correct.  Cosine of 30 radians is 0.1542...   Convert your number to Radians first

1 Radian is 57.2958 degrees.

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<pre><code id="code-20-42576142-1">    ' calculate cosine with angle in degrees
    Private Function Cosd(angle As Double) As Double
        Return Math.Cos(Rad(angle))
    End Function
    ' calculate sine with angle in degrees
    Private Function Sind(angle As Double) As Double
        Return Math.Sin(Rad(angle))
    End Function
    ' convert degrees to radians
    Private Function Rad(degrees As Double) As Double
        Return Math.PI * degrees / 180
    End Function</code></pre>
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    ' calculate cosine with angle in degrees
    Private Function Cosd(angle As Double) As Double
        Return Math.Cos(Rad(angle))
    End Function
    ' calculate sine with angle in degrees
    Private Function Sind(angle As Double) As Double
        Return Math.Sin(Rad(angle))
    End Function
    ' convert degrees to radians
    Private Function Rad(degrees As Double) As Double
        Return Math.PI * degrees / 180
    End Function

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WHEN I USED THIS CODE
<pre><code id="code-10-29100498-1">       ElseIf operation = 8 Then
            TextBox1.Text = Math.Cos(fo)</code></pre>
&quot;FO &quot;IS THE FRIST NUMPER TO WRITE<br />
AND THIS ELSE IF IS IN EQUAL BUTTON FUNCTION<br />
AND WHN I WRITE NUMBER 30 AND PRESS ON COS BUTTON IT GIVE ME 0.154251449887584
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WHEN I USED THIS CODE(CODE)
"FO "IS THE FRIST NUMPER TO WRITE
AND THIS ELSE IF IS IN EQUAL BUTTON FUNCTION
AND WHN I WRITE NUMBER 30 AND PRESS ON COS BUTTON IT GIVE ME 0.154251449887584

COSIEN IS NOT WORKING ON MY CODE

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