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{{Trigonometry}}
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In [[mathematics]], the '''inverse trigonometric functions''' (occasionally also called '''arcus functions''',<ref name="Taczanowski_1978"/><ref name="Hazewinkel_1994"/><ref name="Ebner_2005"/><ref name="Mejlbro_2010"/><ref name="Duran_2012"/> '''antitrigonometric functions'''<ref name="Hall_1909"/> or '''cyclometric functions'''<ref name="Klein_1924"/><ref name="Klein_2004"/><ref name="Dörrie_1965"/>) are the [[inverse function]]s of the [[trigonometric functions]], under suitably restricted [[Domain of a function|domains]]. Specifically, they are the inverses of the [[sine]], [[cosine]], [[tangent (trigonometry)|tangent]], [[cotangent]], [[secant (trigonometry)|secant]], and [[cosecant]] functions,<ref>{{Cite web|last=Weisstein|first=Eric W.|title=Inverse Trigonometric Functions|url=https://mathworld.wolfram.com/InverseTrigonometricFunctions.html|access-date=2020-08-29|website=mathworld.wolfram.com|language=en}}</ref> and are used to obtain an angle from any of the angle's trigonometric ratios. Inverse trigonometric functions are widely used in [[engineering]], [[navigation]], [[physics]], and [[geometry]].[[0=usefull]]
== Notation ==
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