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Aa n dB are two points in the xy-plane, ...

`Aa n dB` are two points in the xy-plane, which are `2sqrt(2)` units distance apart and subtend an angle of `90^0` at the point `C(1,2)` on the line `x-y+1=0` , which is larger than any angle subtended by the line segment `A B` at any other point on the line. Find the equation(s) of the circle through the points `A ,Ba n dCdot`

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