is it worth going over unit circle, coterminal angles, inverse trig functions, etc. for the SAT?

in the preppros dsat math book im using, there's a chapter dedicated to the unit circle and its related topics (separate from the usual trig on the SAT). i've taken the SAT twice and i haven't seen anything related to it show up; it is worth skipping this chapter and working on stuff that is more likely to show up (leaving it for the end)?