factorise: a^3-9b^3+(a+b)^3
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a^3 + (a + b)^3 - 9b^3
= 2 a^3 + 3 a^2 b + 3 a b^2 - 8 b^3
= a^2(2a + 3b) + b^2(3a - 8b)
Not factorable.
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