Calculates the inverse hyperbolic tangent of x, returning a value from ranging from -1 to 1.
Mathematically, atanh(x) = log( (1+x)/(1-x) ) / 2
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Calculates the inverse hyperbolic tangent of x, returning a value from ranging from -1 to 1.
Mathematically, atanh(x) = log( (1+x)/(1-x) ) / 2