# JavaScript | Math.expm1() function

• Last Updated : 28 Jan, 2022

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:

• Google Chrome 38 and above
• Firefox 25 and above
• Opera 25 and above
• Safari 8 and above

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