# **ATAN()**

## **Function Description**

The ATAN() function returns the inverse tangent of the given value (denoted in radians).

## **Function Syntax**

```text
> ATAN(number)
```

## **Parameter definition**

| Parameters | Description |
| ---- | ---- |
| number | Required parameters, any numerical data type can be taken |

## **Example**

```text
drop table if exists t1;
create table t1(a int,b float);
insert into t1 values(1,3.14159);
insert into t1 values(0,1);

mysql> select atan(a),atan(tan(b)) from t1;
+------------------------------------------------------------------------------------------------------------------------------
| atan(a) | atan(tan(b)) |
+------------------------------------------------------------------------------------------------------------------------------
| 0.7853981633974483 | -0.000002535181590113463 |
| 0 | 1 |
+------------------------------------------------------------------------------------------------------------------------------
2 rows in set (0.00 sec)
```