Simplify the following expression as much as possible: \acx4−y4(x−y)(x+y)(x2+y2)\ac{x^4 - y^4}{(x-y)(x+y)(x^2 + y^2)}\acx4−y4(x−y)(x+y)(x2+y2) (assume x2≠y2x^2 \neq y^2x2=y2).
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x2−y2x^2 - y^2x2−y2
x+yx+yx+y