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SHARYGIN 2019 Problem 2

    The circle ω1\omega_1 passes through the center OO of the circle ω2\omega_2 and meets it at points AA and BB. The circle ω3\omega_3 centered at AA with radius ABAB meets ω1\omega_1 and ω2\omega_2 at points CC and DD (distinct from BB). Prove that C,O,DC, O, D are collinear.

    Official text Sharygin Geometry Olympiad 2019 official paper, page 2. Quoted with source.

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