factorise :- x^3 - y^3 + 1+ 3ab
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x^3 - y^3 + 1+ 3xy
(x - y + 1) ( x^2 + y^2+ 1 +xy + y - x )
(x - y + 1) ( x^2 + y^2+ 1 +xy + y - x )
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