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Show that the circle S-= x^(2) + y^(2) +...

Show that the circle `S-= x^(2) + y^(2) + 2gx +`
` 2fy + c = 0` touches the
(i) X- axis if `g^(2) = c`
(ii) Y - axis if `f^(2) = c.`

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