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[" Prove that: "],[a^(3)+b^(3)+c^(3)-3ab...

[" Prove that: "],[a^(3)+b^(3)+c^(3)-3abc=(1)/(2)quad (a+b+c)],[{(a-b)^(2)+(b-c)^(2)+(c-a)^(2)}]

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