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---------------
(x+2)^2
-----------------------=
(2x-1)^2
-----------
(x-2)(x+2)
(2x-1)(2x+1)....(x-2)(x+2)
--------------- *-------------------=
(x+2)^2..........(2x-1)^2
(2x+1)(x-2)
-------------
(x+2)(2x-1)