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Let C1 : x^2 + y^2-2x+2y=0 and C-2 :...

Let `C_1 : x^2 + y^2-2x+2y=0` and `C-2 : x^2+y^2-2x+2y=0` are two given circles. From a moving point P on `C_2`, tangents are drawn to `C_1` at A and B. The locus of orthocentre of `Delta PAB` is

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