- `Y = cosd (X)`

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

This is defined as

> > `%cosd(z) = rad2deg(dos(z))%`

See also: `acosd`, `cos`.

### References

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