(X-6) whole square +( y-3) whole square
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(x-6)+(y-3)
x^2+6^2-2×x×6+y^2+3^2-2×y×3
x^2+36-12x+y^2+9-6y
x^2+y^2-12x-6y+45
x^2+6^2-2×x×6+y^2+3^2-2×y×3
x^2+36-12x+y^2+9-6y
x^2+y^2-12x-6y+45
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