Returns the inverse hyperbolic tangent of a number. Number must be between -1 and 1 (excluding -1 and 1). The inverse hyperbolic tangent is the value whose hyperbolic tangent is number, so ATANH(TANH(number)) equals number.
Number is any real number between 1 and -1.
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||Inverse hyperbolic tangent of 0.76159416 (1, approximately)
||Inverse hyperbolic tangent of -0.1 (-0.10034)