We reviewed for the final by mostly going over problems with trig functions.
Understanding the reciprocal relationships was useful for a few problems.
Sometimes the double angle and half angle formulas were used.
Rewriting the functions in terms of sinx and cosx can be useful. As is knowing that sin^2x + cos^2x = 1 .
It would be helpful to memorize that
sin(0°) = 0
sin(90°) = 1
cos(0°) = 1
cos(90°) = 0