C\index{1} and C\index{2} are circles of unit radius with centers at (0,0) and (1,0),respectively.C\index{3} is a circle of unit radius.It passes through the centers of the circles C\index{1} and C\index{2}and has its center above the x-axis.Find the equation of the common tangent to C\index{1} and C\index{2} which  does not pass through C\index{2}.

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