Answer:
x^8 - x^8
Explanation:
(x^2+ y^2) (x^4 + y^4)(X+y)(x-y)
(x^2+ y^2) (x^4 + y^4) (x^2 - y^2)
(x^2+ y^2) (x^2 - y^2) (x^4 + y^4)
(x^4 - y^4) (x^4 + y^4)
(x^8 - y^8)
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