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I get that: 11pi/4 = 495 degrees. 495 degrees will give you a reference angle of 45 degress. Which I know how to convert to pi/4.

HOWEVER, my solutions manual tells me that I should simply be subtracting 11pi/4 from 3pi. WHERE DOES THIS 3/PI COME FROM?!

My trig class has not discussed the unit circle yet. It seems like I would have to understand that first?? Anyway, I kind of get how to solve the problem, but not in the way that I am supposed to. Please help!

Thanks!