How to be good at angles and trigonometry I am Computer Science Engineer and loved algebra side of Mathematics. But when it comes to trigonometry and angles and triangles, I do not understand anything since college time. And till now also whenever I get chance to avoid sin/cos/tan I consciously (because of fear) avoid that. 
Can you please suggest easiest way to learn trigonometry. 
Kindly do not suggest lengthy books. They will only discourage me at their best.
Thanks in advance
 A: You may want to consider both of the following,


*

*Trigonometry by Gelfand - This text will not bore you... Gelfand's Great! ~\$25

*Schaum's Outline of Trigonometry - Schaum's Outlines are generally quite good. ~\$10

A: Practice is the only way to master any subject in Mathematics. You can look up some high school/college level books. I personally liked "Trigonometry" by S.L. Loney.
However, there are many other references available. Practice as many problems as you can.
A: I just wanted to share my experience learning trig with you. First, let me assure that I have no special aptitude for mathematics. But it only took me about 8 weeks to absolutely master the pre-calculus aspects of trig. I just worked hard, studying several hours every day from a great trig text by Charles P McKeague  (http://www.amazon.com/Trigonometry-Charles-P-McKeague/dp/0495108359/ref=sr_1_1?s=books&ie=UTF8&qid=1374726391&sr=1-1). (Used copies this text will probably run you $20 or so.) I worked every problem in the text; I worked many of the problems sets twice or even three times. I invested quite a bit of time learning the material in those 8 weeks, but when it was over, I had a solid foundation to build on when I went on to study calc. 
You can do it! The bad news is learning trig requires lucubration; the good news is that's basically all it requires. Best of luck to you.
