The quadrants radians are assigned specific solutions. The solutions for each function depends on the domain
Simplify the equation and isolate the variable. Next, identify the reference angles and determine the solutions.
The domain is 0 to 2Pi so the solutions are Pi/4, 3Pi/4, 5Pi/4, and 7Pi/4.
For additional help...
After isolating the variable and solving the general equation, the solutions will depend on whether the equation's angle was positive or negative. The period will also determine how frequency of the solutions.