b^2-2bc+c^2= (b-c)^2 = 9
(b-c)^6 = ((b-c)^2)^3 = 9^3 = 729
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b^2-2bc+c^2= (b-c)^2 = 9
(b-c)^6 = ((b-c)^2)^3 = 9^3 = 729