What should I add to my cheat sheet for calc 2? (Not asking for help cheating!)

https://postimg.cc/PLD9G11X

Prof allows 2 notecards max 4x6, I'm sure I'll pass the exam but I still have one card left. What problems do you think could help me the most to put on it?

I've mainly put down some examples problems, and I slightly struggle with trig

(Also wish me luck, what it takes someone 1 hour to learn it takes me 4 so I'm hoping I do well)