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(2x + 1)(2x - 1)
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4(x + 1)(x - 1)
(2x - 1)(2x + 5)
-((4x + 1)(x - 1))
4x2-y2 = (2x-y)(2x+y)
(2x + 1)(2x + 1) or (2x + 1)2