So firstly: thank you to everyone who gave such great feedback and responses on the last one; I'm so happy to see people have read my stuff and have found it helpful.

Now this post is on a subject that is less directly useful to game dev, but it so prevalent in maths, and is so central to quaternions, that I think it bears an introduction, at least. I haven't gone too too far down the complex number theory/complex analysis rabbit hole, so it should hopefully be pretty comprehensible to everyone, and it builds on the trig we covered last time, so I think it's quite a nice example of how trigonometry ties in to other areas of maths.

The post is [here.]()

Again, please leave feedback, and watch this space for the next post (will be up hopefully by Monday), which will start to cover calculus; I'll probably split the calculus topic into two parts.