File:TrigFnDefs.svg

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