Good book recommendations on trigonometry I need to find a good book on trigonometry, I was using trigonometry demystified but I got sad when I read this line:

Now that you know how the circular functions are defined, you might wonder how the values are calculated. The answer: with an electronic calculator!

I know a book which seems to be really good: Loney's Plane Trigonometry, I'm just not sure if the book is up to date. 

Best trigonometry books which i read А.Ф.БЕРМАНТ, Н.М.БЕСКИН and И.М.ГЕЛФАНД trigonometry books but  in russian you can also look at
1.Palmer C.I, Leigh C.w plane and spherical trigonometry old but really good book and plenty of physics applications
2. I.M Gelfand (russian version is much more rigorous)
3. Bettinger A.K Algebra and trigonometry
4. Swokowski E.W, Cole J.A Algebra and Trigonometry
