Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, see the [ blog post ](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/). 

# ASIN function
<a name="r_ASIN"></a>

ASIN is a trigonometric function that returns the arc sine of a number. The return value is in radians and is between `PI/2` and `-PI/2`. 

## Syntax
<a name="r_ASIN-synopsis"></a>

```
ASIN(number)
```

## Arguments
<a name="r_ASIN-argument"></a>

 *number*   
The input parameter is a `DOUBLE PRECISION` number. 

## Return type
<a name="r_ASIN-return-type"></a>

`DOUBLE PRECISION`

## Examples
<a name="r_ASIN-examples"></a>

To return the arc sine of `1`, use the following example. 

```
SELECT ASIN(1) AS halfpi;

+--------------------+
|       halfpi       |
+--------------------+
| 1.5707963267948966 |
+--------------------+
```

To convert the arc sine of `.5` to the equivalent number of degrees, use the following example. 

```
SELECT (ASIN(.5) * 180/(SELECT PI())) AS degrees;

+--------------------+
|      degrees       |
+--------------------+
| 30.000000000000004 |
+--------------------+
```