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[" 7.The circle "x^(2)+y^(2)-4x+6y+],[C=...

[" 7.The circle "x^(2)+y^(2)-4x+6y+],[C=0" touches "x" -axis if "],[" a."C=4quad " b."C^(2)=4],[" c."C^(2)=16," d.None "]

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