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If you are serous about math, and want to go all the way, I would focus on imaginary numbers and things like the half angle formulas. Even though you probably get a reference sheet, I wished I would have memorized the half angle formulas especially because I see them all the time in proofs and stuff. I you just are trying to get through calc I, remembering stuff like sin(theata)=opp/hyp and how to solve for everything in that formula will help a lot. You probably didn't even need to take precalc 2 desu.
