# TAN

> Calculate the tangent of an angle, provided in radians, using SQL in StackQL.

Source: https://stackql.io/language-spec/functions/math/trigonometric/tan

Calculates the tangent of a specified angle given in radians.

See also:  
[[`SELECT`]](/language-spec/select)

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## Syntax

```sql
SELECT TAN(radian_value) FROM <multipartIdentifier>;
```

## Arguments

__*radian_value*__  
A numeric expression that specifies the angle in radians for which the tangent is to be calculated.

## Return Value(s)
Returns the tangent of the specified angle.

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## Examples

### Calculate the tangent of π/4 radians

```sql
SELECT TAN(PI() / 4) AS tangent_value;
```

This query returns `1`, as the tangent of π/4 radians is 1.

### Calculate the tangent of π radians

```sql
SELECT TAN(PI()) AS tangent_value;
```

This query calculates the tangent of π radians, resulting in approximately `0`, since the tangent of π is very close to 0.