Returns the inverse tangent (arc tangent) of a value in radians.
4.2
https://docs.mongodb.com/manual/reference/operator/aggregation/atan/#mongodb-expression-exp.-atan
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Returns the inverse tangent (arc tangent) of a value in radians.
4.2
https://docs.mongodb.com/manual/reference/operator/aggregation/atan/#mongodb-expression-exp.-atan