We started by focusing on the unit circle. There are two main triangles that form the basis for a lot of what they are doing in the class. 30-60-90 and 45-45-90. Knowing the ratios of the sides for those triangles allows you to more easily do much of the work. So we looked at those triangles in various positions.
Also used SOHCAHTOA and CHOSHACAO
Knowing what sinx and cosx look like graphed can be useful as well.
We also looked at how triangles with 85 degrees and 5 degrees are similar to 90 and 0 degrees and how that can be useful.