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OMM 2010 Problem 3

    Sean C1\mathcal{C}_1 y C2\mathcal{C}_2 dos circunferencias tangentes exteriormente en un punto AA. Se traza una recta tangente a C1\mathcal{C}_1 en BB y secante a C2\mathcal{C}_2 en CC y DD; luego se prolonga el segmento ABAB hasta intersecar a C2\mathcal{C}_2 en un punto EE. Sea FF el punto medio del arco CDCD sobre C2\mathcal{C}_2 que no contiene a EE y sea HH la intersección de BFBF con C2\mathcal{C}_2. Muestra que CDCD, AFAF y EHEH son concurrentes.

    Official text Mexican Mathematical Olympiad 2010 official paper, page 1. Quoted with source.

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