(4) abelian. Prove that the following commute. Let a, b e G such that a and b commute, i.e. ab = ba. Note that we are not claiming G is (a) a-l and b-1 (b) a and b-1 (c) a and ab (d) a² and b2 (e) xax- and xbx-1 for any x e G

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