Returns the inverse tangent (arc tangent) of y / x in radians, where y and x are the first and second values passed to the expression respectively.
4.2
https://www.mongodb.com/docs/manual/reference/operator/aggregation/atan2/#mongodb-expression-exp.-atan2
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Returns the inverse tangent (arc tangent) of y / x in radians, where y and x are the first and second values passed to the expression respectively.