mathjs/docs/reference/functions/cosh.md

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with dif

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# Function cosh

Calculate the hyperbolic cosine of a value,
defined as `cosh(x) = 1/2 * (exp(x) + exp(-x))`.

For matrices, the function is evaluated element wise.


## Syntax

```js
math.cosh(x)
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`x` | number &#124; BigNumber &#124; Complex &#124; Unit &#124; Array &#124; Matrix | Function input

### Returns

Type | Description
---- | -----------
number &#124; BigNumber &#124; Complex &#124; Array &#124; Matrix | Hyperbolic cosine of x


## Examples

```js
math.cosh(0.5)       // returns number 1.1276259652063807
```


## See also

[sinh](sinh.md),
[tanh](tanh.md)