(x+2y+3)²-(x-2y+3)(x-2y-3)

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(x+2y+3)²-(x-2y+3)(x-2y-3)(x+2y+3)²-(x-2y+3)(x-2y-3)(x+2y+3)²-(x-2y+3)(x-2y-3)0

(x+2y+3)²-(x-2y+3)(x-2y-3)
(x+2y+3)²-(x-2y+3)(x-2y-3)

(x+2y+3)²-(x-2y+3)(x-2y-3)
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