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# Function acot
Calculate the inverse cotangent of a value, defined as `acot(x) = atan(1/x)`.
For matrices, the function is evaluated element wise.
## Syntax
```js
math.acot(x)
```
### Parameters
Parameter | Type | Description
--------- | ---- | -----------
`x` | number &#124; Complex &#124; Array &#124; Matrix | Function input
### Returns
Type | Description
---- | -----------
number &#124; Complex &#124; Array &#124; Matrix | The arc cotangent of x
## Examples
```js
math.acot(0.5); // returns number 0.4636476090008061
math.acot(math.cot(1.5)); // returns number 1.5
math.acot(2); // returns Complex 1.5707963267948966 -1.3169578969248166 i
```
## See also
[cot](cot.md),
[atan](atan.md)