filmov
tv
Pre Calculus 6 2 Right Triangles Trigonometry
![preview_player](https://i.ytimg.com/vi/-Ehs0ZdtU_w/maxresdefault.jpg)
Показать описание
Mr. Chen talks about the prove and usage of cofunction, reciprocal, quotient and Pythagorean identities in this video. Notice that the examples are much more difficult compare to what you watch from the trigonometry lesson videos.