1.Solve the following for the principal values of the indicated variable. 2. 3cos x-1=2 3. 3cosx - 1 = 2 3cosx+1=0 im not sure what to do from here, I would ask a teacher or a tutor but it is summer work for a calculus course and i forgot what to do. I have looked in a precalculus book at the library and couldnt understand what i was supposed to do. Please explain how you solve this equation and I will be most grateful.