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[" If a circle "C" passing through the point "quad 7." Let "d in R," and "],[(4,0)" touches the circle "x^(2)+y^(2)+4x-6y=12],[" externally at the point "(1,-1)," then the radius "],[" (a) "sqrt(57)" (5) "5" (c) "2sqrt(5)" (d) "4],[" If "]

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