This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Unitcirclecodefs.svg Characterization of the cosine cotangent and cosecant functions using certain horizontal lines SVG redraw of original work en Image Unitcirclecodefs en User Michael Hardy original Pbroks talk redraw Unitcirclecodefs svg Michael Hardy SVG trigonometric circles
Page 2023 Free-images.com. All images are Public Domain