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MathNet 2020 — Math Olympiad Vault — Part 06 Question 30

Math Olympiad Vault · MathNet 2020 — Math Olympiad Vault — Part 06

Question 30

Let $ABC$ be a triangle with $AB\gt AC$. The angle bisectors at $B,C$ meet at $I$ inside the triangle. The circumcircle of $BIC$ meets $AB$ again at $X$ and $AC$ again at $Y$. Prove $CX\parallel BY$.