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VB.Net program to find the angle for specified cosine value

'VB.Net program to find the angle for 
'specified cosine value.

Module Module1

    Sub Main()
        Dim angle As Double= 0

        angle = Math.Acos(2)
        Console.WriteLine("Angle of specified cosine value is: {0}", angle)

        angle = Math.Acos(0.3584)
        Console.WriteLine("Angle of specified cosine value is: {0}", angle)

        angle = Math.Acos(0.0)
        Console.WriteLine("Angle of specified cosine value is: {0}", angle)
    End Sub

End Module

Output

Angle of specified cosine value is: NaN
Angle of specified cosine value is: 1.20424285296577
Angle of specified cosine value is: 1.5707963267949
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