Why sin and cos dont mean anything

Get better at maths with Brilliant: An excellent summary of this story (found after I did all the research, annoyingly ) can be found here: So, yes, the title is, rather than trigonometric, slightly hyperbolic. Sin and cos are a corruption of the word sinus, and so do have a lexical root and broader meaning. But the point I m trying to make here is that there is no connection between the word sinus and what the functions actually corresp