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Bug in (TAN 10), continued

This looks like it is a compilation bug (AC being clobbered?)
Just get a MACSYMA, quit into LISP, and (TRACE SIN COS).
You'll see that the argument to COS (which should be the same as the 
argument to SIN, obviously) is being clobbered.
The function TAN is defined in MRG;TRIGI > .
(Please try this in OA^K rather than A^K, so I can fix MACSYMA.)