a+b hollcube formula
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a^3 +b^3+3a^b+3ab^2= (a+b)^3
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(a+b)^3 = a^3+b^3+3a^2b+3ab^2
Also,
(a+b)^3 = (a+b)( a^2+b^2-ab)
Also,
(a+b)^3 = (a+b)( a^2+b^2-ab)
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