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OpenStudy (anonymous):
(2x-y)(2x+y)-(2x-y)^2
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OpenStudy (anonymous):
4x^2 + 2xy - 2xy + y^2 - 4x^2 - 2xy + y^2 4x^2 + y^2 - 4x^2 - 2xy + y^2 8x^2 - 2xy
OpenStudy (anonymous):
My mistake it's only -2xy
OpenStudy (anonymous):
the answer is 4xy-2xy^2. I just don't know how they got that
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