- `Y = acoth (X)`

Compute the inverse hyperbolic cotangent of each element of `X`.

This is defined as

> > `%acoth(z) = atanh(1/z)%`

See also: `coth`.

### References

- https://www.mathworks.com/help/matlab/ref/acoth.html
- https://octave.sourceforge.io/octave/function/acoth.html
- https://mathworld.wolfram.com/InverseHyperbolicFunctions.html
- https://en.wikipedia.org/wiki/Inverse_hyperbolic_functions