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NL-BXMO-TST 2022 Problem 2

    Let ABCABC be an acute triangle, and let DD be the foot of the altitude from AA . The circle with centre AA passing through DD intersects the circumcircle of triangle ABCABC in XX and YY , in such a way that the order of the points on this circumcircle is: A,X,B,C,YA, X, B, C, Y . Show that ∠BXD=∠CYD\angle BXD = \angle CYD .

    Dataset text AI-MO AoPS. Quoted with source.

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