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[" c."4x+y=0],[" The equation of the nor...

[" c."4x+y=0],[" The equation of the normal to the circle "x^(2)+y^(2)-8x-2y+12=0" at the points "],[" whose ordinate is "-1," will be "],[" a "2x-y-7=0,2x+y-9=0],[" b."2x+y-7=0,2x+y+9=0],[" c."2x+y+7=0,2x+y+9=0],[" d."2x-y+7=0,2x-y+9=0]

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x+y=0,2x-y=9

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