havercosine
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List of trigonometric identities — Cosines and sines around the unit circle … Wikipedia
Versine — The versine or versed sine, versin(θ), is a trigonometric function equal to 1 − cos(θ) and 2sin2(½θ). It appeared in some of the earliest trigonometric tables and was once widespread, but it is now little used. There are several related functions … Wikipedia
hacoversed sine — noun The trigonometric function equal to half the coversed sine. Abbreviation: hacoversin Syn: cohaversine, hacoversine, havercosine … Wiktionary
