# JavaScript | Math.expm1() function

Math.expm1() is an inbuilt function in JavaScript which is used to get the value of ep-1, where p is any given number.
The number e is a mathematical constant having an approximate value equal to 2.718.
It was discovered by the Swiss mathematician Jacob Bernoulli.
This number is also called Euler’s number.
Syntax:

`Math.expm1(p)`

Parameter: This function accepts a single parameter p, which is the parameter and it is any number.

Returns: It return the value of ep-1, where p is any given number as parameter.

Example:

```Input  :Math.expm1(0)
Output : 0
```

Explanation:
Here the value of parameter p is 0, So after putting the value 0 instead of p in ep-1
then its value becomes 0.

Let’s see JavaScript program:
Example

 ` `

Output:

``` 0
1.718281828459045
6.38905609893065
-0.6321205588285577
147.4131591025766
8.025013499434122
-0.9592377960216338
```
• Example 2: Error, here parameter should must be a number otherwise it give error or NaN i.e., not a number.

 ` `

Output:

`Error: C is not defined`
• Example 3:

 ` `

Output:

`NaN`
• Application: Whenever we need to find the value of ep-1, where p is any given number that time we take the help of Math.expm1() function in JavaScript.

• Example:

 ` `

Output:

``` 0
1.718281828459045
6.38905609893065
19.085536923187668
53.598150033144236
147.4131591025766
402.4287934927351
1095.6331584284585
2979.9579870417283
8102.083927575384
```
• Supported Browsers: The browsers supported by JavaScript Math.expm1() function are listed below:

• Internet Explorer
• Firefox
• Opera
• Safari My Personal Notes arrow_drop_up Check out this Author's contributed articles.

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Improved By : ManasChhabra2

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