Hello,i want to learn calculus with the infinitesimal approach, but before i need to refresh some precalculus. I have 3 different options and i was wondering if you could help me pick the best one or the most efficent at least.
1)Khan academy precalculus (https://www.khanacademy.org/math/precalculus)
2)Stewart precalculus: mathematics for calculus
3)Simmons Precalculus mathematics in a nutshell.
I don't know if it helps; but, i did precalc, calc I and II in uni. Sadly, i don't remember very much.