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Let the circles S1 = x2 + y2 – 9 = 0 and S2 = x2 + y2 – 10x + 9 = 0 cut each other at A and B. Let C1 and C2 be centres of circle S1 and S2 respectively. The equation of circumcircle of triangle C1AC2 is

@Karan-Yadav