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# Function asin
Calculate the inverse sine of a value.
For matrices, the function is evaluated element wise.
## Syntax
```js
math.asin(x)
```
### Parameters
Parameter | Type | Description
--------- | ---- | -----------
`x` | number &#124; BigNumber &#124; Complex &#124; Array &#124; Matrix | Function input
### Returns
Type | Description
---- | -----------
number &#124; BigNumber &#124; Complex &#124; Array &#124; Matrix | The arc sine of x
## Examples
```js
math.asin(0.5); // returns number 0.5235987755982989
math.asin(math.sin(1.5)); // returns number ~1.5
math.asin(2); // returns Complex 1.5707963267948966 -1.3169578969248166 i
```
## See also
[sin](sin.md),
[atan](atan.md),
[acos](acos.md)