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by Basic (28 points)
=6(x^4 - y^4)

=6[(x^2)^2 - (y^2)^2]

=6[(x^2 - y^2)(x^2 + y^2)                                                                         [(a+b)(a-b)=a^2 - b^2]

=6[(x+y)(x-y)(x^2 + y^2)]

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