Math.atanh()

The Math.atanh() static method returns the inverse hyperbolic tangent of a number. That is,

∀x∊(−1,1),𝙼𝚊𝚝𝚑.𝚊𝚝𝚊𝚗𝚑(𝚡)=artanh(x)=the unique y such that tanh(y)=x=12ln(1+x1−x)begin{aligned}forall x in ({-1}, 1),;mathtt{operatorname{Math.atanh}(x)} &= operatorname{artanh}(x) = text{the unique } y text{ such that } tanh(y) = x \&= frac{1}{2},lnleft(frac{1+x}{1-x}right)end{aligned}

Because atanh() is a static method of Math, you always use it as Math.atanh(), rather than as a method of a Math object you created (Math is not a constructor).

Syntax example: Math.atanh(x)