Digging in the wiki, I found this relation between 'arc-functions' and 'arc-functions-hyperbolics"(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\\ arcsinh(x)= i \arcsin(-ix) \\ arccosh(x)= i \arccos(+ix) \\ arctanh(x)= i \arctan(-ix)[/tex] https://it.wikipedia.org/wiki/Funzioni_iperboliche#Funzioni_iperboliche_di_argomento_complesso

Happens that I never see in anywhere a relation between those functions. This relationship is correct?

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# Relation between inverse trigonometric function

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