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The unexpectedly hard windmill question (2011 IMO, Q2)
A beautiful international math olympiad problem👇
Germany : A Beautiful Math Olympiad Problem | How to Solve?
International Math Olympiad 2010 Problem 1 - A beautiful functional equation from the IMO
Hard Problems The Road to the World's Toughest Math Contest
Chinese IMO team
A Very Nice Olympiad Math Radical Problem
China ┃A Nice algebra Problem ┃Math Olympiad
This U.S. Olympiad Coach Has a Unique Approach to Math
Math Olympiad Question | You should know this trick!!
How to win the International Math Olympiad | Po-Shen Loh and Lex Fridman
International Math Olympiad 2010 - Q4: A nice geometry from the IMO