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**1.Solve the following for the principal values of the indicated variable.**

**2. 3cos x-1=2**

**3. 3cosx - 1 = 2**

3cosx+1=0

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.