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Show that |{:(a,b,c),(b,c,a),(c,a,b):}|^...

Show that `|{:(a,b,c),(b,c,a),(c,a,b):}|^2=|{:(2bc-a^2,c^2,b^2),(c^2,2ac-b^2,a^2),(b^2,a^2,2ab-c^2):}|=(a^3+b^3+c^3-3abc)^2`

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