Okay, I know that there are two possible solutions to this that being 30 degrees and 330 degrees. I don't understand where that 2kpi is coming from though. Is that like the same thing as 2pi being one circle while k is how many times it should loop? Anywho, I'm still confused over this. I got the answer by subtracting pi/4 from pi/6 and 5pi/6, which would make it -pi/12 and 7pi/12.