A=Point[Circle[(0, 0), 4]]
B=Reflect[A, x = 5]
Locus[B,A] works perfect, but LocusEquation[B,A] makes an error.
i think there is a bug with "reflect object in line"
here is a work using reflect object in point
I agree with you, I also think there is a bug with "Reflect about Line" command when using LocusEquation command.
There is also a bug when using "Dilate from Point" command for the same use.
In your ggb file, If you use "E'=Dilate[E, -1, F]" instead of "Reflect[E, F]" you'll get the same E' point but undefined LocusEquation.
Thank you for reporting this. This problem has already been reported in https://jira.geogebra.org/b....
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