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3Blue1Brown has a nice new video on how to calculate the eigenvalues of 2×2 matrices. The most common way to find the eigenvalues of a 2×2 matrix A is working straight from the definition, solving det(A – λI) = 0. This is fine when you’re learning what eigenvalues are. But if you’ve already learned all […] The post Trick for 2×2 eigenvalues first appeared on John D. Cook....