a^3+b^3+a^2-b^2
(a+b)(a^2-ab+b^2)+(a+b)(a-b)
(a+b)(a^2-ab+b^2+a-b)
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a^3+b^3+a^2-b^2
(a+b)(a^2-ab+b^2)+(a+b)(a-b)
(a+b)(a^2-ab+b^2+a-b)