360 bytes added
, 14:57, 16 July 2011
http://commons.wikimedia.org/wiki/File:Unitcircledefs.svg
Characterization of the sine, tangent, and secant functions using certain vertical lines. SVG redraw from original work.
Date
4 July 2008
Source
en:Image:Unitcircledefs.png
Author: Michael Hardy (original); Pbroks13 (talk) (redraw)
Permission: Released into Public Domain by author Michael Hardy