# Function asech

Calculate the hyperbolic arccos of a value,
defined as `asech(x) = ln(sqrt(1/x^2 - 1) + 1/x)`.

For matrices, the function is evaluated element wise.


## Syntax

```js
math.asech(x)
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`x` | Number | Boolean | Complex | Unit | Array | Matrix | null | Function input

### Returns

Type | Description
---- | -----------
Number | Complex | Array | Matrix | Hyperbolic arcsecant of x


## Examples

```js
math.asech(0.5);       // returns 1.3169578969248166
```


## See also

[acsch](acsch.md),
[acoth](acoth.md)


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