Factorie a+b cube minus a minus b cube
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Step-by-step explanation:
(a+b)³-(a-b)³
=a³+3a²b+3ab²+b³-(a³-3a²b+3ab²-b³)
=a³+3a²b+3ab²+b³-a³+3a²b-3ab²+b³)
=6a²b+2b³
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