1. A trigonometric function equal to one minus the sine of an angle, or equivalently, the versine of the complement of an angle.
Usage: mathematics; technical; rarely used in modern practice; largely replaced by more standard trigonometric functions

Examples

• The coversine of an angle θ is defined as 1 − sin(θ).
• In historical trigonometric tables, the coversine was sometimes listed alongside sine and cosine values.
• The coversine function is related to the versine by the complementary angle relationship.