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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]],
== Notation ==
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