>And it's super awesome with tau: one tau is full circle, and one period. Well, if you've already made the jump to understanding negative heights as going belo

>And it's super awesome with tau: one tau is full circle, and one period. Well, if you've already made the jump to understanding negative heights as going below the real line. This is a topic for an introductory course in geometry? When I learned about sine and cosine, it was first defined in terms of SOHCAHTOA!