factorise x^4 y^4 - xy
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x⁴ y⁴ - xy
= (xy)⁴ - xy
= xy ( x³y³ - 1)
= xy [ ( xy) ³ - 1) ]
= xy ( xy - 1) ( x²y² + xy +1)
[ since a³ - b³ = ( a - b ) ( a² + ab + b² )]
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