(2x-y)²-4(x-y)(x+2y)

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(2x-y)²-4(x-y)(x+2y)(2x-y)²-4(x-y)(x+2y)(2x-y)²-4(x-y)(x+2y)

(2x-y)²-4(x-y)(x+2y)
(2x-y)²-4(x-y)(x+2y)

(2x-y)²-4(x-y)(x+2y)