We went to see our normal maths teacher to ask him about trig because we didn't understand any of it and he said his class was taking, a whole week and another lesson to learn it.
And it's probably not too hard to guess that trigonometry will be somehow relevant, so anyone comfortable with their trig functions could probably hazard a guess as to what the right formula is.
We'll talk more about that in just a bit, but for now know that it includes most of the ordinary functions that you could write down, things like polynomials, exponentials, trig functions, all of that.
My trig equations were far beneath his abilities, but if he was bored he didn't show it; he just explained the principles patiently, over and over. The gate opened a little, and I peeked through it.