Question : Need to be able to call up an ASIN function just like the one in Excel

I need the ASIN trigonometry function (just like the one in Excel) in my Access database. Does anyone know the code for this so that I can put it in a module and call it from a query or can I only call it directly from Excel.  I'd prefer havin it as a module withinthe database  Thanks

Answer : Need to be able to call up an ASIN function just like the one in Excel

Function PI() As Double
  PI = Atn(1) * 4
End Function