math arccos for math> math arccos {flags} 
--degrees, -d: Return degrees instead of radians| input | output | 
|---|---|
| list<number> | list<number> | 
| number | number | 
Get the arccosine of 1
>1|math arccos
0
Get the arccosine of -1 in degrees
>-1|math arccos-d
180
Tips: Command math arccos 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_arccos.html