The Sum of the Trilinear Coordinates of a Point

Given a triangle , the trilinear coordinates of a point are the signed distances to the extended sides. Denote the signed distances of to , and by , and , respectively. If and the incenter are in the same half-plane determined by a side, the signed distance to that side is positive; otherwise, it is negative.
Let the triangle's circumcenter be , the circumradius be and the inradius be . Then the sum of the signed distances is:
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