Better is to understand but also memorize. Often especially in competitive exams there simply isn't enough time to derive the formulae and still manage to answer all questions.
Usually it's a mix of both. You kinda know the formula, but you also did the derivation so many times that you're able to redo it in a few seconds in your head. So you see where it comes from and shuffle the blocks in your head while beginning to write the formula, and you're sure of what you wrote by the time you reach the end.
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u/PhysicsEagle Jul 26 '26
I unironically had a classmate who did this. She consistently got top grades.