Douglas Downing's Trigonometry Made Easy is also a really great book for non-maths people. Same approach of situating Trigonometry in a mythical fantasy land. I remember Trigonometry as a chore of trying to memorize double-angle formulas and such, but this book really helped connect trig in an intuitive way.
I didn't know he had a calculus book, I'll have to check it out now.
I didn't know he had a calculus book, I'll have to check it out now.