verify a minus b whole cube
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(a - b)³
as we know
(a - b)³ = (a - b) (a - b) (a - b)
= and here by the multiplying two (a - b) we get
= a² + b² - 2ab × (a - b)
= a³ - a²b + ab² - b³ - 2a²b + 2ab²
= a³ - b³ - 3a²b + 3ab² ( verified )
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