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# Atan

> Use the Sigma Atan function to compute the arctangent of the given angle.

The **Atan** function computes the arctangent of the given angle.

## Syntax

`Atan(value)`

Function arguments:

* **value** (required) - The value whose arctangent will be calculated.

## Related resources

* [Atan2](/docs/atan2)
* [Tan](/docs/tan)