1. Plural of coversine; in trigonometry, the complement of the versine of an angle, equal to 1 minus the versine.
Usage: mathematics; technical; rarely used in modern mathematics; largely replaced by standard trigonometric functions

Examples

• Coversines were used in historical navigation tables before modern calculators became available.
• The coversine function relates to the versine through the identity: coversine(θ) = 1 − versine(θ).
• Early mathematicians computed coversines to simplify certain astronomical calculations.
• In older trigonometric handbooks, you may find tables of sines, cosines, and coversines listed together.