The Go programming language uses the **`Expm1`** function to find the value of $e$ raised to the power equaling the input $x$, minus $1$. This is the same as $e^x$ -1, where $x$ is the input.

To use this function, you must import the `math` package in your file and access the `Expm1` function within it using the `.` notation (`math.Expm1`). Here, `Expm1` is the actual function, while `math` is the Go package that stores the definition of this function.

# Function definition

The definition of the `Expm1` function inside the `math` package is:


# Parameters
The `Expm1` function takes a single argument of type `float64`. This argument represents the number $x$ in the formula $e^x$ -1.


# Return value

The `Expm1` function returns a single value of type `float64`, which results from raising $e$ to the power of $x$, minus $1$ ($x$ being the input `float64`).

 ﻿An exception to the above statements is when you pass something that is positive infinity, negative infinity, or `NAN` as an argument:

* `+Inf`: If the argument has a positive infinite value, the return value will be exactly the same as the argument, i.e., `+Inf`.

* `-Inf`: If the argument has a negative infinite value, the return value will be -1.

* `NAN`: If a `NAN` argument is passed, the return value is also `NAN`. 




# Examples



Following is a simple example where we find out the `Expm1` value of `5`:

package main

import (
	"fmt"
	"math"
)

func main() {
	x := 5.0
	y := math.Expm1(x)
	fmt.Print(x, "'s exponential value minus 1 is ", y)
}

The following example shows how the `Expm1` function handles infinite valued arguments, for which we use the `Inf` function:

> The `Inf` function returns an infinite value with a sign matching the sign of the argument that it is given.

package main

import (
	"fmt"
	"math"
)

func main() {
	x := math.Inf(-1)
	y := math.Expm1(x)
	fmt.Print(x, "'s exponential value minus 1 is ", y)

	fmt.Print( "\n")


	a := math.Inf(1)
	b := math.Expm1(a)
	fmt.Print(a, "'s exponential value minus 1 is ", b)

}

What is the Expm1 function in Golang?

The Go programming language uses the Expm1 function to find the value of eee raised to the power equaling the input xxx, minus 111. This is the same as exe^xex -1, where xxx is the input. To use this function, you must import the math package in your file and access the Expm1 function within it using the . notation (math.Expm1). Here, Expm1 is the actual function, while math is the Go package that stores the definition of this function. Function definition The definition of the Expm1 function inside the math package is: 