# SIN

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

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

Calculates the sine of a specified angle given in radians.

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

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## Syntax

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

## Arguments

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

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

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## Examples

### Calculate the sine of π/2 radians

```sql
SELECT SIN(PI() / 2) AS sine_value;
```

This query returns `1`, as the sine of π/2 radians is 1.

### Calculate the sine of π radians

```sql
SELECT SIN(PI()) AS sine_value;
```

This query calculates the sine of π radians, resulting in approximately `0`, as the sine of π is 0.