# ATAN

```
ATAN(numExpr)
```

Returns the trigonometric arc tangent of an expression.

Available in:

| Processors | SQL Studio |
| ---------- | ---------- |
| ✓          | ✓          |

*Sample code:*

```sql
USE `kafka`;
SELECT ATAN(pickup_longitude) 
FROM nyc-yellow-taxi-trip
LIMIT 1;
```

*Output:*

```json
{
  "value": {
    "ATAN": "-1.5572801259337674"
  }
}
```