Arctan operation gives result as arcsin

[jcruzcode]

For example,

arctan(2) displays as arcsin(2) which is not equal

https://newton.now.sh/api/v2/arctan/2
{operation: 'arctan', expression: '2', result: 'arcsin(2)'}
expression: '2'
operation: 'arctan'
result: 'arcsin(2)'
[[Prototype]]: Object

[Lukeplusplus3002]

Opened a PR about this