---
title: math.sinh
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/functions/math-trig/math-sinh
---

```
FLOAT math.sinh(FLOAT x)
```

**Available in:** all subroutines

Computes the hyperbolic sine of its argument `x`.

## Parameters

`x` - Floating point value representing a hyperbolic angle.

## Return Value

Upon successful completion, this function returns the hyperbolic sine of `x`.

If `x` is `math.NAN`, a NaN will be returned.

If `x` is ±0, or `math.POS_INFINITY`
or `math.NEG_INFINITY`, `x` will be returned.

If `x` is _subnormal_, a range error occurs and `x` will be returned.

If the result would cause an overflow, a range error occurs and
`math.POS_HUGE_VAL` or
`math.NEG_HUGE_VAL` (with the same sign as
`x`) will be returned.

### Errors

If the `x` argument is _subnormal_ or if the result would cause an overflow, then
`fastly.error` will be set to `ERANGE`.

## Example

```vcl
declare local var.fo FLOAT;

set var.fo = math.sinh(-1);
```