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(a + b)² =
a² + 2ab + b²
(a – b)² =
a² – 2ab + b²
a² – b² =
(a – b)·(a + b)
a³ + b³ =
(a + b)·(a² – ab + b²)
a³ – b³ =
(a – b)·(a² + ab + b²)
(a + b)³ =
a³ + 3a²b + 3ab² + b³
(a – b)³ =
a³ – 3a²b + 3ab² – b³
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