I wish there was an ATAN2 function as in Excel.
queries, reports, forms
Tom Wickerath commented
You should be able to call any of the Excel functions from within Access, using a little VBA code. Not what you asked for, but better than nothing. If you are interested, I have an old sample from 2007 that uses MS Access to call two Excel functions. These calculate the probability and NORMINV. Both early binding and late binding (no checked reference to Excel required) is available--the sample is currently set to use late binding.