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atanh(expr0) ⇒ number
The atanh() function returns the inverse hyperbolic tangent of the argument as a number. The corresponding mathematical notation and a mathematical identity of the function are:
The domain is the open interval (-1, 1).
Use the calculator at the top right of the window to find the inverse hyperbolic tangent of a number. Click the [2nd] key at the top left of the keypad, then click [atanh].