Groups and FieldsHardGalois Theory ShareGalois Theory · Hard problemGal(Q(ζ8)/Q)≅U(8)\operatorname{Gal}(\mathbb Q(\zeta_8)/\mathbb Q)\cong U(8)Gal(Q(ζ8)/Q)≅U(8). How many of its elements have order 222?Check Show answer Walk through it step by step Practice more like this Review this concept