##=(xy-2)(x^2y^2+2xy+2)##

##x^3y^3-8##

or

##(xy)^3-2^3##

Since ##a^3-b^3=(a-b)(a^2+ab+b^2)##

or

##=(xy-2)((xy)^2+2xy+2)##

##=(xy-2)(x^2y^2+2xy+2)##

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