$$1 + 2 ( 2 x - 3 y ) + ( 2 x - 3 y ) ^ { 2 }$$
$\left(2x-3y+1\right)^{2}$
$$1+4x-6y+\left(2x-3y\right)^{2}$$
$$1+4x-6y+4x^{2}-12xy+9y^{2}$$
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$4x^{2}-12xy+4x+9y^{2}-6y+1$
