Hey everyone! I want to study trigonometry thoroughly without having to take the course, mostly since I'm taking Precalculus this semester and I'll be learning most of the principles of trigonometry in this course. I want to study it carefully so that I can get myself better prepared for Calculus, and I thought it would be a good idea if I buy myself a used textbook and study it over Thanksgiving and winter break. Is there a good textbook anyone would reccomend me to read? Thank you.