simplification of atan2(0,x)



Dear all,

I sometimes get as an intermediate solution of a calculation atan2(0,x).

When x:5, then trigreduce knows that atan2(0,5) = 0, but when x is defined as 
a constant or nothing is assumed on x, then atan2 stays. 

I don't speak lisp, but I think the simplification atan2(0,x)=0 can be done by 
adding something in comm2.lisp?

Best,
NB