SHARYGIN 2018 Problem 7
Let be a common point of circles and . Let be a common tangent to these circles, and be a line parallel to , such that and lie on , and lie on . The circles and meet for the second time at point . Prove that bisects one of arcs of circle .
Official text Sharygin Geometry Olympiad 2018 official paper, page 2. Quoted with source.
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