17. (Dificultad: 8/10 EN VIDEO  Se cortan los lados de un ángulo XO^Y con una secante AB¯ (A sobre OX¯ y B sobre OY¯). Luego se trazan las bisectrices de XA^B y de YB^A que se encuentran en R. Demostrar que OR¯ es bisectriz del ángulo XO^Y.

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