(16x^4+y^4)(4x^2+y^2)(2x-y)(2x+y)
=(16x^4+y^4)(4x^2+y^2)(4x^2-y^2)
=(16x^4+y^4)(16x^4-y^4)
=256x^8-y^8
(16x^4+y^4)(4x^2+y^2)(2x-y)(2x+y)
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