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2. (2x + y) (2x - y) (2x+y)
kalau gak salah sih kayak gitu :)
= 4a²-4a-4a+4
= 4a²-8a+4
2. (2x-y) = (2x-y) (2x-y)
= 4x²-2xy-2xy+y²
= 4x²-4xy+y²