# Function sech

Calculate the hyperbolic secant of a value,
defined as `sech(x) = 1 / cosh(x)`.

For matrices, the function is evaluated element wise.


## Syntax

```js
math.sech(x)
```

### Parameters

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

### Returns

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


## Examples

```js
// sech(x) = 1/ cosh(x)
math.sech(0.5);       // returns 0.886818883970074
1 / math.cosh(0.5);   // returns 1.9190347513349437
```


## See also

[cosh](cosh.md),
[csch](csch.md),
[coth](coth.md)


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