- `Y = secd (X)`

Compute the secant for each element of `X` in degrees.

This is defined as

> > `%secd(z) = rad2deg(sec(z))%`

See also: `asecd`, `sec`.

### References

- https://www.mathworks.com/help/matlab/ref/sec.html
- https://octave.sourceforge.io/octave/function/secd.html
- https://mathworld.wolfram.com/TrigonometricFunctions.html
- https://en.wikipedia.org/wiki/Trigonometric_functions