[Potironette]

What is a frequency in graphing? And can tangent, cotangent, secant, or cosecant graphs have frequency? All I know is, if I need to answer what a frequency is on my test, I'm going to write the reciprocal of the period. But I don't actually know what the frequency is.


Also, why do arccos, arcsin, and arctan exist as functions? It's weird that arctan is the only one that extends forever along the x-coordinate. Whereas stuff like arccos(2) or arcsin(2) turns out undefined.