[Pat Fairbank]

I just uploaded a second revision to the trig library. There was a bug in the way the previous versions were handling the C function calls in assembly - the software stack wasn't being manipulated properly, with the result that the trig functions would work as expected when called from a function that didn't have local variables, but would return strange values when called from a function that did.

So if you're using the library and are seeing strange return values, you probably have an older version and need to update to Revision 2.