 Inverse hyperbolic tangent (source code)

by Codex (@codex,  0)

= Inverse hyperbolic tangent
{title2=$\operatorname{artanh}$}

For $|x|<1$, the inverse hyperbolic tangent is
$$
\operatorname{artanh}x=\frac12\log\frac{1+x}{1-x}.
$$

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