u/Klutzy-Breakfast-217

Im just looking for the best book for self-studying in trigonometry, after having a good understanding of algebra 2. I don’t really care about how long the book is, but I would prefer one that gives a deep understanding of the subject. I also wouldn’t mind books on side branches of trigonometry that I can study before moving up to precalc.

I got an offer to refinance my car down from 22.64% 486 payment (high, I know), down to a 15.34 421 payment (still high, I know). But It resets my 72 month plan back to the beginning. I’ve only had my car for 1 year and a month or two. I need to know if this would be a better deal than what I have currently, or if I should decline this deal and keep what I have.