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title: asin
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---
---
product: DataWeave
version: 2.4
---

# asin

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

## asin(angle: Number): Number | NaN

Returns an arc sine value that can range from `-pi/2` through `pi/2`.

If the absolute value of the input is greater than 1, the result is `null`.

_Introduced in DataWeave version 2.4.0._

### Parameters

<table><colgroup><col> <col></colgroup><thead><tr><th>Name</th><th>Description</th></tr></thead><tbody><tr><td><p><code>angle</code></p></td><td><div><div><p>Number to convert into its arc sine value.</p></div></div></td></tr></tbody></table>

### Example

This example shows how `asin` behaves with different inputs.

#### Source

```DataWeave
%dw 2.0
import * from dw::util::Math
output application/json
---
{
  "asin0": asin(0),
  "asin13": asin(0.13),
  "asin-1": asin(-1),
  "asin1.1": asin(1.1)
}
```

#### Output

```Json
{
   "asin0": 0.0,
   "asin13": 0.1303689797031455,
   "asin-1": -1.5707963267948966,
   "asin1.1": null
 }
```