(2a+b)³ - (2a-b)³ =
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2a^3 +12a^2b +6ab^2+b^3 - (2a^3 -12a^2b +6ab^2-b^3)
2a^3 +12a^2b +6ab^2+b^3 - 2a^3 +12a^2b -6ab^2 + b^3
24a^2 + 2b^3
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