Factorise a cube minus A square b + 1 by 3 a b square minus 1 by 27 b cube
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a3-a2b+1/3ab2-1/27b3
(a-1/3b) cube
(a-1/3b) cube
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a3-a2b+1/3 ab2-1/27b3
(a-1/3b) cube
(a-1/3b) cube
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