I suspect you have already tried the manual:

http://www.microengineeringlabs.com/...ces/pbpmanual/

It has some info on using the SIN/COSINE operators. As for radians, is this a problem? Converting between radians and degrees is quite simple if needs be:

2pi radians in 360 degrees. PBP doesn't have a PI function, but you could easily define a constant that is ~pi (3.141....)

How exactly are you getting the angle from the acceleration?

Sorry not to be more help.

Ben