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Find centre and radius of the following ...

Find centre and radius of the following circles.
(i) ` x^(2) + ( y +2)^(2) =0`
(ii) ` x^(2) + y^(2) + 6x -4y + 4 =0`
(iii) ` x^(2) + y^(2) -x + 2y-3=0`
(iv) ` 2x^(2) + 2y^(2) - 6x + 4y + 2=0`

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