You, me, and my first International Math Olympiad problem
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EXTREME quintic equation! (very tiring)
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The Return of the Legend of Question Six - Numberphile
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so you want a VERY HARD math question?!
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Magical Squaring
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Solving An Insanely Hard Problem For High School Students
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He won 4 gold medals in the International Math Olympiads: tips and tricks
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My math teacher did this! 0.999...=1? Reddit r/theydidthemath
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