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(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
atanh — Areatangens hyperbolikus
Gibt den inversen Tangens hyperbolikus von num
zurück, d.h. den Wert dessen Tangens hyperbolikus
num
ergibt.
num
Der zu verarbeitende Wert.
Der Areatangens hyperbolikus von num
.