We did problems with trigonometry reviewing for the final.

The six trig functions are the ones in the two acronyms

SOHCAHTOA

CHOSHACAO

Sine, cosine, tangent, cosecant, secant, cotangent

One problem had numbers that looked like a 30 60 90 triangle.

A few times, the substitution of 1 = sin^2x + cos^2x

The trig functions can all be written in terms of sine and cosine and really, you could even write everything in terms of sine (but that wouldn’t be useful in this context).

It would help sometimes to be more comfortable with radians.