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Let A be one point of intersection of tw...

Let `A` be one point of intersection of two intersecting circles with centres `Oa n dQdot` The tangents at `A` to the two circls meet the circles again at `Ba n dC` , respectively. Let the point `P` be located so that `A O P Q` is a parallelogram. Prove that `P` is the circumcentre of the triangle `A B Cdot`

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