# TAN()

The SQL `TAN()` function is a mathematical function that returns the tangent of an angle given in radians. It takes one argument, the angle, and returns the tangent value as a numeric result.

## Syntax

```SELECT TAN(angle);
```

`angle` is the radian value, for which the tangent is calculated.

Note: The `TAN()` function operates using radians as its input, not degrees. To convert degrees to radians, the degree value can be multiplied by π/180.

## Example

In this example the following data is given in the table `angles`:

id angle_in_degrees
1 80
2 45
3 170

The `TAN()` function can be used to calculate the `tangent_value`:

```SELECT id, angle_in_degrees, TAN(angle_in_degrees * (PI()/180)) AS tangent_valueFROM angles;
```

The output will be:

id angle_in_degrees tangent_value
1 80 5.67128181961771
2 45 1.0
3 170 -0.176326980708465

Note: For the use of this method with SQL databases like MySQL, PostgreSQL, SQLite, or SQL Server, refer to their respective documentation for more details on the `TAN()` function implementation and compatibility.