Question Abstract Algebra?
Be G one group is n ∈ ℕ, n>1 suppose what (xy)^n = X^nY^n, ∀ x,y ∈ G. Show that Gn = (z ∈ G: z^n - e) is one normal subgroup in G?
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See
https://answers.yahoo.com/question/index?qid=20160...
though since the language errors are identical, I expect that was you in the first place (going anonymous is not good when you want to ask questions again)