Trigonometry

I am exploring trigonometry as part of my project to read again the "Advanced Level Pure Mathematics" which is very similar to the text book I read 45 years ago, only this time I hope to enjoy rather than just endure.Also this time I am tackling all of the problems. 

I plan to document concisely the theory and some worked examples that are thought either neat or were a challenge.

Click on following for more information

1. Trigonometry - Basics

2. Trig functions of sum of 2 angles.

3. Sine of sum of 2 angles

4. Cosine of sum of 2 angles

5. Law of Cosines or Cosine Formula

6. Wikipedia Trigonometric functions