olymmath

IR-TST 2023 Problem 4

    line ll through the point AA from triangle ABCABC . Point XX is on line ll . ωb{\omega}_b and ωc{\omega}_c are circles that through points X,AX,A and respectively tanget to ABAB adn ACAC . tangets from B,CB,C respectively to ωb{\omega}_b and ωc{\omega}_c meet them in Y,ZY,Z . Prove that by changing XX , the circumcircle of the circle XYZXYZ passes through two fixed points.

    Proposed by Ali Zamani

    Dataset text AI-MO AoPS. Quoted with source.

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