(x-y)(x+y)(xx-yy)=?
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(x-y)(x+y)(xx-yy)=?
(x-y)(x+y)(xx-yy)=?
(x-y)(x+y)(xx-yy)=?
(x-y)(x+y)(xx-yy)
=(x^2-y^2)(x^2-y^2)
=x^4-2x^2y^2+y^4
(x-y)(x+y)(xx-yy)=?
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