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[" Ghere of : "],[[" 1"," 1"," 1"],[" a "," b "," c) "],[" bc "," ca "," ab "]]

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|[1, 1, 1], [a, b, c], [bc, ca, ab]| = (a-b)(b-c)(c-a)

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Prove the following : [[1,bc,a(b+c)],[1,ca,b(c+a)],[1,ab,c(a+b)]] =0