Good book recommendations on trigonometry

You might want to look at the following book references:

• Trigonometry, I.M. Gelfand, Mark Saul

• Trigonometry Refresher (Dover Books on Mathematics), A. Albert Klaf, Mathematics

• Schaum's Outline of Trigonometry, 5th Edition, Robert Moyer, Frank Ayres

• Trigonometry, 8th Edition, Ron Larson ($$$)

• Advanced Trigonometry, by C.V. Durell, A. Robson

You might also want to review online items. For example:

• Khan Academy

• Trig WikiBooks

• Open Course Ware on Trigonometry

Enjoy!

Plane Trigonometry by S.L. Loney is the best book for trigonometry.The concepts are explained in a very good manner in the book.

Michael Corral's Trigonometry is excellent, building geometric foundations before transitioning to analytical aspects. It also helps that it's absurdly good-looking. It comes with a GNU Free Documentation License too.

If you want to learn trigonometry from basic level then S.L.Loney's Plane Trigonometry is the best one. It takes us through various levels of understanding trigonometry gradually without the feel of difficulty.

An underrated source that's also low priced is Precalculus In A Nutshell by George F. Simmons: This was the last of the amazing textbooks by Simmons, which include such classics as An Introduction To Topology and Modern Analysis and Differential Equations with Applications and Historical Notes. Each of these books is marked by Simmons’ unique combination of detailed exposition, lively prose and conceptual clarity. This is his last and most elementary book and it’s no exception. Simmons’ purpose of this beautiful book is to condense into a readable, lucid treatment what he deemed essential for high school students to learn before learning basic calculus.He covers just what he deems necessary in algebra, geometry and trigonometry for mastering calculus-and I think his choice of topics is very good indeed. I think you'll find it very helpful.