Some of the 2nd-3rd year math courses I took in university (I want to say it was calculus, but may have been algebra or combinatorics) allowed us to bring in a single page cheat sheet with formulas and the like. The idea was that we weren’t there to memorize formulas, which can easily be looked up, but rather to learn the concepts BEHIND the formulas and how to apply them to solve problems. Just memorizing the formulas themselves wasn’t a very useful thing to teach us, and they recognized that.
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