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CZ-SK-MO 2020 Problem 2

    The triangle ABCABC is given. Inside its sides ABAB and ACAC , the points XX and YY are respectively selected Let ZZ be the intersection of the lines BYBY and CXCX . Prove the inequality [BZX]+[CZY]>2[XYZ][BZX] + [CZY]> 2 [XY Z] , where [DEF][DEF] denotes the content of the triangle DEFDEF .

    (David Hruska, Josef Tkadlec)

    Dataset text AI-MO AoPS. Quoted with source.

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