So there I was, ready to brush up on my trigonometry, when I discovered to my amazement that the high school textbook I’d saved from my own early math years was next to useless.  The explanations were awkward and convoluted, the examples didn’t seem to illustrate the accompanying instructions, and the diagrams barely supported the text. I spent a few minutes awash in astonishment that I’d learned anything at all in the company of the book before deciding that perhaps I’d prefer to do my brushing up with a more cooperative text.  I was just about to call a friend who might have also saved a trig book when I remembered a little book my mom got me for my birthday one year. I think she bought it because she liked the looks of it and she still can’t believe she successfully raised a math-loving child. It’s a little tiny hardback called Useful Mathematical & Physical Formulae.
It features a little cartoon wizard who can be found throughout the book helping to demonstrate and illustrate various concepts. He makes the whole thing entertaining as well as useful. And it’s not just formulas - there are lots of helpful reminders about where the formulas came from as well as enough to explain many of them to beginners. It’s also artfully done - the kind of math book you might enjoy even if you definitely don’t enjoy math. It turned out that the section about trig was just exactly what I needed to remind myself how it all works, with the circles and the right triangles, etc. It’s a great gift for a math lover, and a great reference for anyone who uses the stuff. Thanks, Mom.