math arctan for math> math arctan {flags} 
--degrees, -d: Return degrees instead of radians| input | output | 
|---|---|
| list<number> | list<number> | 
| number | number | 
Get the arctangent of 1
>1|math arctan
0.7853981633974483
Get the arctangent of -1 in degrees
>-1|math arctan-d
-45
Tips: Command math arctan was not included in the official binaries by default, you have to build it with --features=extra flag
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