Students in trigonometry are usually taught about six functions:

I really enjoyed this article about trigonometric functions that were used in previous generations but are no longer taught today, like and :

http://blogs.scientificamerican.com/roots-of-unity/10-secret-trig-functions-your-math-teachers-never-taught-you/

Naturally, Math With Bad Drawings had a unique take on this by adding a few more suggested functions to the list. My favorites:

### Like this:

Like Loading...

*Related*

*Posted by John Quintanilla on April 14, 2016*

https://meangreenmath.com/2016/04/14/10-secret-trig-functions-your-math-teachers-never-taught-you/