The Unit Circle

Here is a useful image of the unit circle labeled with the “special angles” and the coordinates of the corresponding points on the unit circle:

unit-circle-trig

(via http://etc.usf.edu/clipart/43200/43215/unit-circle7_43215.htm)

This image is useful since you can use it to find the sine and cosine of any of the given angles, using the definitions of sin t and cos t as the y- and x-coordinates, respectively, of the point on the unit circle corresponding to the angle t:

186px-Unit_circle.svg

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