- `Y = cos (X)`

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

See also: `acos`, `cosd`, `cosh`.

### References

- https://www.mathworks.com/help/matlab/ref/cos.html
- https://octave.sourceforge.io/octave/function/cos.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