- `Y = sec (X)`

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

This is defined as

> > `%sec(z) = 1/cos(z)%`

See also: `asec`, `secd`, `sech`.

### References

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