I've looked in a couple of books, and can't find this anywhere, i'm looking for the opposite of the cos funtion, i.e. I know the cos of the angle, and need to know the actual size of the angle, is there an implicit function? If not, how can I achieve the same result? Any help would be much appreciated...

grandfilth
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Newbie Poster

## Recommended Answers

Jump to Posttry this function :

`Public Function ArcCos(ByVal X As Double) As Double If X <> 1 Then ArcCos = Atn(-X / Sqr(-X * X + 1)) + 2 * Atn(1) Else ArcCos = 0 End If End Function`

## All 4 Replies

invisal
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Search and Destroy

grandfilth
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Newbie Poster

invisal
381
Search and Destroy

grandfilth
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Newbie Poster

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