Question


Answer

Transform to the patter of the difference of squares

(x^2+y^2)^2-4x^2y^2

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

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

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

Steven Zheng posted 1 month ago

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