The **`Atanh`** function in the Go programming language is used to find the inverse hyperbolic tangent value passed to it as input.

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

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## Syntax

The definition of the `Atanh` function inside the `math` package is shown below:

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## Parameters

The `Atanh` function takes a single argument of type `float64` that represents the angle whose inverse hyperbolic tangent value you want to find.

## Return value
The `Atanh` function returns a single value of type `float64` that represents the inverse hyperbolic tangent value of the argument. The possible range of all return values is between *negative infinity* and *positive infinity*.


> An exception to the above statements is when you pass something that is less than *-1*, greater than *+1*, or  `NAN` as an argument. In these cases, the `Atanh` function returns `NAN`.





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## Code

Below is a simple example in which we use the `Atan` function to find the inverse hyperbolic tangent value of 0.5:

package main

import "fmt"
import  "math"

func main() {
	
	x := math.Atanh(0.5)
	fmt.Println(x)
} 

The following example shows how passing `NAN` as an argument makes the `Atanh` function return `NAN`:


package main

import "fmt"
import  "math"

func main() {
	
	x := math.Atanh(1.5)
	fmt.Println(x)
} 

What is the Atanh function in Golang?

Atanh finds inverse hyperbolic tangent. Import math, and use `math.Atanh`. Handles float64, returns NAN for out-of-range or NAN inputs.