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Versine
1 minus the cosine of an angle / From Wikipedia, the free encyclopedia
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For the archaic unit of mass, see Versine in WP:de.
"versin" redirects here. For the Polish village, see Versin (village).
The versine or versed sine is a trigonometric function found in some of the earliest (Sanskrit Aryabhatia,[1] Section I) trigonometric tables. The versine of an angle is 1 minus its cosine.
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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.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/fe/Unit-circle_sin_cos_tan_cot_exsec_excsc_versin_cvs.svg/190px-Unit-circle_sin_cos_tan_cot_exsec_excsc_versin_cvs.svg.png)