You see nonlinear equations, they see linear algebra! (Harvard-MIT math tournament)
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My First Harvard MIT Math Tournament Problem
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so you want a VERY HARD math question?!
9:15
The BIGGEST rectangle under y=x^3 (but NO calculus!)
22:44
Matrix trace isn't just summing the diagonal | Lie groups, algebras, brackets #5
6:46
How to solve a hard nonlinear system of equation
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L'épreuve de mathématique la plus terrifiante (ENS 1966)
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believe in the math, not wolframalpha
31:21