Using PI and ArcCos in SQL line

Hi folks,
I'm really stumped and need help .. on my ASP page, I'm running a line of SQL that has a calculation in it. In this calculation, I use PI and ARCCOS functions.

As my database is in Access, I have a module that has these functions detailed, but when I go to run the ASP page, it doesn't recognise these functions.

What can I do to get around this problem? Sorry if this is an obvious one, but i'm a newbie so please forgive me :o)