# COSH

**The COSH function returns the hyperbolic cosine of a number.**

This function takes a single [Number](../../variable-data-types/the-number-variable-data-type) as input. It outputs that Number's hyperbolic cosine.

#### Declaration

```javascript
COSH(number) -> hyperbolic_cosine
```

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#### Parameters

**number** (required, type: _Number_) The number to calculate the hyperbolic cosine of.

#### Return Values

**hyperbolic\_cosine** (type: _Number_) The hyperbolic cosine of the given number.

#### Examples

The following example returns the hyperbolic cosine of 1:

```javascript
COSH(1) -> 1.5430806348152437
```
