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== {{anchor|ver|vcs|cvs|cvc|hav|hvc|hcv|hcc|lhav}}Pregled ==
'''Versinus'''<ref name="Inman_1835" /><ref name="Abramowitz_1972" /><ref name="Weisstein_vers" /><ref name="Tapson_2004" /><ref name="Atlas_2009" /> ili '''obrnuti sinus'''<ref name="Weisstein_vers" /><ref name="Korn_2000" /><ref name="Clagett_1969" /><ref name="Precalc_1999" /><ref name="Calvert_2004">{{cite web|url=http://www.du.edu/~jcalvert/math/trig.htm|title=Trigonometry|date=14. 9. 2007|orig-year=2004<!-- 2004-01-10 -->|url-status=live|author-first=James B.|author-last=Calvert|archive-url=https://web.archive.org/web/20071002214133/http://mysite.du.edu/~jcalvert/math/trig.htm|archive-date=2. 10. 2007|access-date=8. 11. 2015|url-status=dead}}</ref> je trigonometrijska funkcija koja se pojavljivala u najranijim trigonometrijskim tablicama. Piše se kao '''versin(''&#x3B8;'')''',<ref name="Weisstein_vers" /><ref name="Clagett_1969" /><ref name="Precalc_1999" /> '''sinver(''&#x3B8;'')''',<ref name="Braunmühl_1903">{{cite book|url=https://books.google.com/books/about/Vorlesungen_%C3%BCber_Geschichte_der_Trigono.html?id=2Kc_AQAAIAAJ|title=Vorlesungen über Geschichte der Trigonometrie - Von der Erfindung der Logarithmen bis auf die Gegenwart|date=1903|publisher=[[B. G. Teubner]]|volume=2|location=Leipzig, Germany|page=231|language=German|trans-title=Lectures on history of trigonometry - from the invention of logarithms up to the present|author-link=Johann Anton Edler von Braunmühl|access-date=9. 12. 2015|author-first=Anton|author-last=Edler von Braunmühl}}</ref><ref name="Cajori_1929" /> '''vers(''&#x3B8;'')''',<ref name="Inman_1835" /><ref name="Abramowitz_1972" /><ref name="Weisstein_vers" /><ref name="Tapson_2004" /><ref name="Atlas_2009" /><ref name="Korn_2000" /> '''ver(''&#x3B8;'')'''<ref name="Shaneyfelt">{{cite web|url=http://www2.hawaii.edu/~tvs/trig.html|title=德博士的 Notes About Circles, ज्य, & कोज्य: What in the world is a hacovercosine?|publisher=[[University of Hawaii]]|location=Hilo, Hawaii|url-status=livedead|author-first=Ted V.|author-last=Shaneyfelt|access-date=8. 11. 2015|archive-url=https://web.archive.org/web/20150919053929/http://www2.hawaii.edu/~tvs/trig.html|archive-date=19. 9. 2015}}</ref> ili '''siv(''&#x3B8;'')'''.<ref name="Cauchy_1821">{{anchor|Cauchy-1821}}{{cite book|title=Cours d'Analyse de l'Ecole royale polytechnique|date=1821|publisher=L'Imprimerie Royale, Debure frères, Libraires du Roi et de la [[Bibliothèque du Roi]]|volume=1|language=French|chapter=Analyse Algébrique|author-link=Augustin-Louis Cauchy|author-first=Augustin-Louis|author-last=Cauchy|title-link=Cours d'Analyse}}[https://books.google.com/books?id=UrT0KsbDmDwC&pg=PA11&lpg=PA11] (reissued by [[Cambridge University Press]], 2009; {{ISBN|978-1-108-00208-0}})</ref><ref name="Bradley_2009">{{anchor|Bradley-2009}}{{cite book|url=https://books.google.com/books?id=M0or-HGe7D0C|title=Cauchy’s Cours d’analyse: An Annotated Translation|date=14. 1. 2010|work=Sources and Studies in the History of Mathematics and Physical Sciences|publisher=[[Springer Science+Business Media, LLC]]|others=[[Augustin-Louis Cauchy|Cauchy, Augustin-Louis]]|isbn=978-1-4419-0548-2|pages=10, 285|doi=10.1007/978-1-4419-0549-9|lccn=2009932254|id=1441905499, 978-1-4419-0549-9|access-date=9. 11. 2015|orig-year=2009|author1-first=Robert E.|author1-last=Bradley|author2-first=Charles Edward|author2-last=Sandifer|editor1-first=J. Z.|editor1-last=Buchwald}} (See [[Versinus i haversinus#Bradley-Errata|errata]].)</ref> Na [[Latinski jezik|latinskom]], ova funkcija je poznata kao ''sinus versus''<ref name="Cauchy_1821" /><ref name="Bradley_2009" /> (obrnuti sinus), ''versinus'', ''versus'' ili ''sagitta'' (strijela).
 
Ova funkcija se može izraziti preko prave sinusne (t.j. "vertikalne" [[sinus]]ne (''sinus rectus'')) i [[kosinus]]ne (''cosinus rectus'') funkcije u obliku: