math cos for math> math cos {flags} 
--degrees, -d: Use degrees instead of radians| input | output | 
|---|---|
| list<number> | list<number> | 
| number | number | 
Apply the cosine to π
>3.141592|math cos|math round--precision4
-1
Apply the cosine to a list of angles in degrees
> [090180270360] |math cos-d
╭───┬───────╮
│0│1.00│
│1│0.00│
│2│-1.00│
│3│0.00│
│4│1.00│
╰───┴───────╯
Tips: Command math cos was not included in the official binaries by default, you have to build it with --features=extra flag
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    https://www.nushell.sh/commands/docs/math_cos.html