(3x-2y)²-(2x-y)(2x-3y)+(2x+y)(2x-y)
=(3x-2y)²-(2x-y)[(2x-3y)-(2x+y)]
=(3x-2y)²-(2x-y)[(2x-3y)-(2x+y)]
=(3x-2y)²+4y(2x-y)
=9x²-12xy+4y²+8xy-4y²
=9x²-4xy
(3x-2y)²-(2x-y)(2x-3y)+(2x+y)(2x-y)
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