If I define a polynomial

f=(x^4+x^2+1)^2

and find the roots via

f.roots()

I get four roots each with multiplicity one. However,

(f^2).roots()

yields exactly the same answer: four roots with multiplicity one(!)  
each. If f is a "simpler" polynomial, such as f=x^4+1, a correct  
multiplicity is reported.

Stefan



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