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(2x - 1)^2 .( 2x - 1)(2x -1) ...(2x)(2x)+ (2x)(-1)+ (-1)(2x)+ (-1)(-1).....4x^2 - 2x - 2x +1
-------------= ------------------- = ------------------------------------------------------- = --------------------
2^2 ..............4 .................................4..........................................4
4x^2 - 4x + 1
= -------------------
........4