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Coordinate Geometryhard
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Two circles have equations (x−1)2+y2=4(x - 1)^2 + y^2 = 4(x−1)2+y2=4 and (x+1)2+y2=4(x + 1)^2 + y^2 = 4(x+1)2+y2=4. Find the equation of their radical axis.