Why are sin, cos and tan called sin, cos and tan?

Why are sin, cos and tan called sin, cos and tan? You can help to support future videos on Patreon:   / graphicmaths   Where do the names of the trig functions come from? This video explains where the terms sine, tangent, and secant come from, and how they relate to the geometry of the unit circle. It also explains the origins of name cosine, cotangent and cosecant, and why the inverse functions are called arc functions. Suitable for UK GCSE, IB MYP, US grades 9+. Typically taught to students aged 14 and above. Other videos: Parts of a circle:    • Parts of circle   Related articles: Why are the trig functions called sine, cosine and tangent?: https://graphicmaths.com/gcse/trigono... Parts of a circle: https://graphicmaths.com/gcse/geometr... Links: Website: https://graphicmaths.com text versions of these videos. Twitter:   / graphicmaths   Reddit:   / graphicmaths   Patreon:   / graphicmaths   please consider becoming a patron to support this channel. This video was created using generativepy, a free and open source Python library for creating mathematical art and animations, available from https://github.com/martinmcbride/gene...