​↵XYZ is a triangle in which a circle is embedded with center O. The circumference of the circle meets the sides of triangle at A,B and C. A is along the side XZ, B along ZY and C along XY. A and B are joined. The line joining Y and O, if extended, meets AB at R. X and R are joined. Prove that angle XRY = 90 degree.​​

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