(a+b+c)(b+c-a) (c+a-b) (a+b-c)
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Answer:
a(b+c-a) +a(c+a-b)+a(a+b-c)+b(b+c-a)+b(c+a-b)+b(a+b-c)+c(b+c-a)+c(c+a-b)+c(a+b-c)
ab+ac-a^2 +ac+a^2-ab+a^2+ab-ac+b^2+bc-ba+bc+ba-b^2+ba+b^2-bc+cb+c^2-ca+c^2+ca-cb+ca+cb-c^2
ac+ab+bc+ca+cb+a^2+c^2
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