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Anonymous
(1 - x4y4) = (1 + x2y2)*(1 - x2y2)
= (1 + x2y2)*(1 + xy)*(1 - xy)
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(1 - xy)(1 + xy)(1 + x^2y^2)
(x - 1)(x + 1)
(2x - 1)(2x + 1)
9(2x - 1)(2x + 1)
(x - 1)(x^2 + x + 1)
(x - 1)(x4 + x3 + x2 + x + 1)