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The equation (x -x (1)) (x -x(2)) + (...

The equation
` (x -x _(1)) (x -x_(2)) + (y -y_(1))(y- y _(2)) =0` represents a circle whose centre is

A

`((x_1-x_2)/2,(y_1-y_2)/2)`

B

`((x_1+x_2)/2,(y_1+y_2)/2)`

C

`(x_1,y_2)`

D

`(x_2,y_2)`

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