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[" Consider a family of circles which are passing through "],[" the point "(-1,1)" and are tangent to "x" -axis.If "(h,k)" are "],[" the coordinates of the centre of the circles,then the "],[" set of values of "k" is given by the interval "[" AIEEE "-2007]],[[" (1) "0=1/2],[" (3) "-1/2<=k<=1/2," (4) "k<=1/2]]

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