Analysis of information sources in references of the Wikipedia article "Inverse trigonometric functions" in English language version.
[…] α = arcsin m: It is frequently read "arc-sine m" or "anti-sine m," since two mutually inverse functions are said each to be the anti-function of the other. […] A similar symbolic relation holds for the other trigonometric functions. […] This notation is universally used in Europe and is fast gaining ground in this country. A less desirable symbol, α = sin-1m, is still found in English and American texts. The notation α = inv sin m is perhaps better still on account of its general applicability. […]
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: CS1 maint: DOI inactive as of November 2024 (link) However, the term "arcus function" can also refer to the function giving the argument of a complex number, sometimes called the arcus.