acube + bcube + ccube formula
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82
a3 + b3 + c3 - 3abc = (a + b + c)(a2 + b2 + c2 - ab - bc - ca)....
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a3 + b3 + c3 = (a+b+c)3 - 3ab(a+b) -3bc(b+c) -3ac(a+c) - 6abc
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