Great app, minor problem. But still love it
Well I just started using this app since yesterday and I woke up in the middle of the night and I just started studying more of these videos, however I came across video (#7) where it seems you have stated in the end that Sin=pie/1 and Cos=pie/0 then you have Tan=1/0; I thought that Tan=X/Y therefore stating that Sin should equal pie/0 and Cos should equal pie/1. I only say this because I dont think people should get confused with these problems henceforth; possibly put a side note into that video to let people know. But maybe Im wrong, I just started yesterday after all.
-Hector J Rosa III
Hexson about
Khan Academy: Trigonometry, v1.0.1