✨ Best Answer ✨
(ーi)⁶＝(ーi)× (ーi)× (ーi)× (ーi)× (ーi)× (ーi)
＝i× i× i× i× i× i
＝i²×i²×i²＝(ー1)× (ー1)× (ー1)
＝ー1
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