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Show that |{:(a^(2)+x^(2),ab-cx,ac+bx),...

Show that `|{:(a^(2)+x^(2),ab-cx,ac+bx),(ab+cx,b^(2)+x^(2),bc-ax),(ac-bx,bc+ax,c^(2)+x^(2)):}|=|{:(x,c,-b),(-c,x,a),(b,-a,x):}|^(2)`.

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