File:Unitcircledefs.png
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![File:Unitcircledefs.png](http://upload.wikimedia.org/wikipedia/commons/thumb/6/6c/Unitcircledefs.png/410px-Unitcircledefs.png)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 21:51, 11 May 2008 | ![]() | 412 × 602 (7 KB) | Michael Hardy | Characterization of the sine, tangent, and secant functions using certain vertical lines. |
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