The following code
> var("z y z")
> f = (x-y)^2*(y-z)*(z-x) + (y-z)^2*(z-x)*(x-y) + (z-x)^2*(x-y)*(y-z)
> f.expand()
outputs 0.
But
> f.factor()
simply prints the original formula (x-y)^2...
Maybe something is wrong?
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