I did not know that and Google failed me.It is \(\displaystyle 1-sin\theta\). It stands for co-versin. Compare with the green versin.
To be honest, I've never heard of it before but I googled "versin"or versine.I did not know that and Google failed me.
All the cats that I know do that - e.g. Garfield.....To be honest, I've never heard of it before but I googled "versin"or versine.
Wikipedia: "The versine or versed sine is a trigonometric function already appearing in some of the earliest trigonometric tables. It is written as versin(θ), sinver(θ), vers(θ), ver(θ) or siv(θ)."
(I like to sound smarter than I am!)
Response #2 says:You were told that the coversine is defined as [MATH]1 - \cos(\theta)[/MATH]. That's easy enough to find on a calculator.
Perhaps you need to tell us what you are trying to calculate, given what values.