cos(A)=0.15425~~~

[chxxangie]

cos(A)=0.15425
how to get A value?

[leinad31]

do you have msdn library installed? have you tried searching there first?

[mehul.pandya]

hi,
what is A?
and u can get value like

Cos(0.15425)

which returns double value.

[chxxangie]

i didn't install the msdn library...
what i want to know is, how to get the A (is an angle) value.

cos(A)=0.15425 (the 0.15425 is in radian, not degree).............

[jcis]

Private Sub Command1_Click()
    MsgBox "A = " & ArcCos(0.15425)
End Sub

Function ArcCos(X As Double) As Double
    ArcCos = Atn(-X / Sqr(-X * X + 1)) + 2 * Atn(1)
End Function

[jemidiah]

you might want to add in some error handling, since the inverse cosine is only defined for inputs between -1 and 1. Also, ArcCos(1) = 0, ArcCos(-1) = pi