# SIN function
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SIN is a trigonometric function that returns the sine of a number. The return value is between `-1` and `1`. 

## Syntax
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```
SIN(number)
```

## Argument
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 *number*   
A `DOUBLE PRECISION` number in radians. 

## Return type
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`DOUBLE PRECISION` 

## Example
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To return the sine of `-PI`, use the following example.

```
SELECT SIN(-PI());

+-------------------------+
|           sin           |
+-------------------------+
| -0.00000000000000012246 |
+-------------------------+
```