| ▲ | epgui 6 hours ago | |
Weird, in Canada (at least some provinces) I think that's a pretty standard part of both high school and undergraduate maths. | ||
| ▲ | dhosek 4 hours ago | parent [-] | |
The relationships between the functions are pretty standardly taught, but their derivation from the right triangles on the unit circle less so (other than sin and cos). | ||