(2x+3y)(2x-3y)-(2x-y)^2(2x-y+3)(2x+3+y)
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(2x+3y)(2x-3y)-(2x-y)^2(2x-y+3)(2x+3+y)
(2x+3y)(2x-3y)-(2x-y)^2
(2x-y+3)(2x+3+y)
(2x+3y)(2x-3y)-(2x-y)^2(2x-y+3)(2x+3+y)
(2x+3y)(2x-3y)-(2x-y)^2
=4x²-9y²-4x²-y²+4xy
=4xy-10y²;
(2x-y+3)(2x+3+y)
=(2x+3)²-y²
=4x²+12x+9-y²;
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