olymmath

JBMO-SL 2014 G2

    Let ABCA B C be an acute triangle with AB‾<AC‾<BC‾\overline{A B}<\overline{A C}<\overline{B C} and c(O,R)c(O, R) be its circumcircle. Denote with DD and EE be the points diametrically opposite to the points BB and CC, respectively. The circle c1(A,AE‾)c_{1}(A, \overline{A E}) intersects AC‾\overline{A C} at point KK, the circle c2(A,AD‾)c_{2}(A, \overline{A D}) intersects BAB A at point L(AL(A lies between BB and LL ). Prove that the lines EKE K and DLD L meet on the circle cc.

    Dataset text NuminaMath olympiads. Quoted with source.

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