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reference number on the unit circle Let t be a real number. The reference number associated with t is the shortest distance along the unit circle between the terminal point determined by t and the x-axis.
Im asked to find the reference number of 9 pi. I know that if t lies in Quadrant 1, t equals the reference number. In quadrant 2, the reference number is pi - t. In quadrant 3, its t- pi, and quadrant 4 its 2pi - t. However 9 pi doesn't fall on any quadrant. How do I proceed from here? Yes it does.
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