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Description: Returns the inverse hyperbolic tangent of a number. The inverse hyperbolic tangent is the value whose hyperbolic tangent is Number, so ATANH(TANH(Number)) equals Number.
Syntax: ATANH(Number)
Number is any real number between 1 and -1.
Example:
ATANH(-0.1) = -0.10034 [the inverse hyperbolic tangent of -0.1]
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