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.
Keywords from Image Description:
Trigonometric functions and inverse.svg en visual depiction for deriving trig functions of inverse functions like sin cos tan sin etc own Maschen cczero See also File Trigonometric functions and inverse svg File Trigonometric functions and inverse svg Uploaded with Euclidean geometry Trigonometric functions Trigonometric triangles