> The tangent goes infinite at 90 & 270 degrees.  Hard on conversions.

Right, that's why you don't do SIN/COS and take the arctangent.  You use SIN
and COS separately in the arctangent process.  Most math libraries have a
routine for this, usually called something like ARCTAN2.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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