What’s a good textbook for pre-calculus and trigonometry?
Which should I do first?
My school uses Precalculus: Enhanced with Graphical Utilities by Sullivan, Sullivan.
You should do trig first because trig concepts will be used in precalc.
My school uses Precalculus with Limits by Ron Larson and Precalculs with Limits: A Graphing approach by Larson, Hostetler, and Edwards.
I would also recommend Algebra and Trigonometry 9e by Ron Larson so that you can review Algebra 2 concepts as well. It covers trigonometry as well as some precalculus.