Solving an IMO problem with the Incenter-Excenter Lemma - 2006 IMO Problem 1

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In this video, we solve problem 1 of the 2006 IMO. CREDITS: MAA

At 8:50, I write AP ≥ AL, and I refer to this statement for the rest of the video. This is false. It should say AP ≥ AI.

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