a square+ 2ab +b square multiply by a-b
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= (a²+2ab+b²)(a-b)
= (a³+2a²b+ab² -a²b - 2ab² - b³)
= (a³ + a²b - ab² - b³)
= a²(a+b) - b²(a+b)
= (a²-b²)(a+b)
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