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
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