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KMO 2023 Problem 1

    In a triangle ABC (AB‾<AC‾)ABC ~(\overline{AB} < \overline{AC}) , points D(≠A,B)D (\neq A, B) and E(≠A,C)E (\neq A, C) lies on side ABAB and ACAC respectively. Point PP satisfies PB‾=PD‾,PC‾=PE‾\overline{PB}=\overline{PD}, \overline{PC}=\overline{PE} . X(≠A,C)X (\neq A, C) is on the arc ACAC of the circumcircle of triangle ABCABC not including BB . Let Y(≠A)Y (\neq A) be the intersection of circumcircle of triangle ADEADE and line XAXA . Prove that PX‾=PY‾\overline{PX} = \overline{PY} .

    Dataset text AI-MO AoPS. Quoted with source.

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