Versine

The versine or versed sine is a trigonometric function found in some of the earliest (Sanskrit Aryabhatia, Section I) trigonometric tables. The versine of an angle is 1 minus its cosine.

For the archaic unit of mass, see Versine in WP:de.
"versin" redirects here. For the Polish village, see Versin (village).
Trigonometry
Reference
Laws and theorems
Calculus
Look up versine  or versed sine in Wiktionary, the free dictionary.

There are several related functions, most notably the coversine and haversine. The latter, half a versine, is of particular importance in the haversine formula of navigation.

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