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ahh that makes sense. thanks. btw you know when do the results come out for these exams?Okay I know why
You need to go back to your CAST diagram
In the ALL quadrant you'll have your related angle i.e. your first solution
But if you think about it, everytime you solve for theta, you look at the other quadrant its in as well right?
Because tan is positive its gonna be in the first and third quadrant, where the solution is pi + the related angle
Soooo it will be pi + (pi - theta) and therefore (2pi - theta)