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=(x+y)(x-y)(x+y)(x-y)-(x2-y2)(x2+y2)
=(x2-y2)2-(x4-y4)
=x4-2x2y2+y4-x4+y4
=2y4-2x2y2
=2y2-(y2-x2)
=(x2-y2)2-(x4-y4)
=x4-2x2y2+y4-x4+y4
=2y4-2x2y2
=2y2-(y2-x2)
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