# 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 | BigNumber | Complex | Unit | Array | Matrix | Function input ### Returns Type | Description ---- | ----------- number | BigNumber | Complex | Array | Matrix | Hyperbolic cosine of x ## Examples ```js math.cosh(0.5) // returns number 1.1276259652063807 ``` ## See also [sinh](sinh.md), [tanh](tanh.md)