Cosine Rule (Part 1) - Trigonometric Ratios (Year 1) - Edexcel AS and A Level Maths

Edexcel AS and A Level Maths. Cosine Rule (Part 1). Pure Year 1 Chapter 9: Trigonometric Ratios. Sin, Cos and Tan. SOHCAHTOA. Unit Circle.

Sorry for the long wait. Said there would be more vids at Christmas, but coursework took a lot more time than expected. Have chapter 10 completely ready to go out bar editing the YouTube details. Will be out really soon after these ones if not straight away.
Anyway, all of this topic is just GCSE revision, so hopefully not too bad.
In this particular video, I talk for a few mins about the unit circle and how to get values of sin theta and cos theta out of it. Kind of annoyed how long that part took as I really don't think you need to know much about it. Don't worry about it too much. I only mentioned it as the spec specifically details it, but I don't really know why it does.

Timestamps:
00:00 SOHCAHTOA
03:09 SOHCAHTOA examples
08:03 Unit circle
13:11 Cosine Rule
15:07 Cosine Rule example 1