\[\begin {array} {1 1} (a)\;x^2+y^2-6x+6y+9=0 \\ (b)\;x^2+y^2-6x-6y+9=0 \\ (c)\;x^2+y^2+6x-6y+9=0 \\ (d)\;x^2+y^2+6x+6y+9=0 \end {array}\]

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