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Even for simple locus problems I get "undefined" for LocusEquation (see attached) or I get a Java error and it shuts down.
I have done exactly the same problem in GeoGebra 4.4 and it works fine. I want to use with my students but they will have the updated version.
Any suggestions?
Files:
locus parabola...
The same problem 
works fine here with your file. Do you have any other problematic examples you could share?
I think there is a not desirable behaviour of locusequation
when
the point is defined in intersection of two lines and there is a
position with the same line for intersection then the locusequation
includes the equation of the line as factor of expression
the intersection[a,a] must be empty
see the difference: yellow vs red locus
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