Animated Trigonometry

The unit circle can be used to project sin , cos and tan simultaneously in this animated diagram.

The graphs of sin and tan are projected horizontally ( sin is the "wave") and cos is projected vertically.

Written using JavaScript and D3. Inspired by Tony Garnock-Jones' post where he generates the same animation using Squeak.

Requires a SVG-capable browser e.g. Mozilla Firefox or WebKit (Google Chrome, Safari &c.) — anything but Internet Explorer!