Factorise
a³+3a²b+3ab²+2b³
ans: (a+2b) (a²+b²+ab)
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(a³ + a²b + ab²) + (2a²b + 2ab² + 2b³)
a(a² + ab + b²) + 2b(a² + ab + b²)
(a + 2b) (a² + b² + ab)
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