a plus b whole cube minus a cube plus b cube
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(a+b)^3-a^3+b^3
a3+b3+3ab(a+b)-a3+b3
2b^3+3a^2b+3ab^2
a3+b3+3ab(a+b)-a3+b3
2b^3+3a^2b+3ab^2
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