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

[" 28.Prove that "],[qquad (a+b+c)^(3)-a^(3)-b^(3)-c^(3)=3(a+b)(b+c)(c+a)]

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Prove that (a+b+c)^(3)-a^(3)-b^(3)-c^(3)=3(a+b)(b+c)(c+a) .

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