- `Y = csch (X)`

Compute the hyperbolic cosecant of each element of `X`.

This is defined as

> > `%csch(z) = 1/sinh(z)%`

See also: `acsch`.

### References

- https://www.mathworks.com/help/matlab/ref/csch.html
- https://octave.sourceforge.io/octave/function/csch.html
- https://mathworld.wolfram.com/HyperbolicFunctions.html
- https://en.wikipedia.org/wiki/Hyperbolic_functions