# Math.expm1

## Function

Natural exponent minus one. Return exp(value) - 1.

## Syntax

```bt
Math.expm1(value)
```

## Parameters

| Parameters | Type | Required | Default value | Description |
| ------ | ------ | ------ | ------ | ------ |
| value | Number | Yes | None | Exponent. |

## Return value

| Type | Description |
| ------ | ------ |
| Int/Float | Returns exp(value) - 1. An Int is returned for integer results, and a Float for non-integer or non-finite results. |

## Example

```bt
result = Math.expm1(1)

// Output: 1.718281828459045
print result
```

## Notes

- Better for maintaining f64 accuracy when using decimal input than manual subtraction.