Returns the inverse hyperbolic tangent value of the argument, which must be between -1 and 1 (minus -1 and 1).
The hyperbolic tangent of the inverse hyperbolic tangent value is the value of the number parameter of the function, so ATANH(TANH(number)) is equal to number.
grammar
ATANH (number)
Any real Number between Number -1 and 1.
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