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The coordinates of two points Pa n dQ a...

The coordinates of two points `Pa n dQ` are `(x_1,y_1)a n d(x_2,y_2)a n dO` is the origin. If the circles are described on `O Pa n dO Q` as diameters, then the length of their common chord is `(|x_1y_2+x_2y_1|)/(P Q)` (b) `(|x_1y_2-x_2y_1|)/(P Q)` `(|x_1x_2+y_1y_2|)/(P Q)` (d) `(|x_1x_2-y_1y_2|)/(P Q)`

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