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

To use the `Tanh` function, you must import the `math` package in your file and use the `.` notation (`math.Tanh`) to access the `Tanh` function. Here, `Tanh` 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 `Tanh` function inside the `math` package is shown below:

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## Parameters

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



## Return value
The `Tanh` function returns a single value of type `float64` that represents the hyperbolic tangent value of the argument. The possible range of all return values is between -1 and +1.

> An exception to the above statements is when you pass something that is `NAN` as an argument. In these cases, the `Tanh` function returns a `NAN`.



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## Examples

Below is a simple example where we use the `Tanh` function to find the hyperbolic tangent value of 25:

package main

import "fmt"
import  "math"


func main() {
	
	x := math.Tanh(25)
	fmt.Println(x)
} 

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


package main

import "fmt"
import  "math"

func main() {
	
	x := math.Tanh(math.NaN())
	fmt.Println(x)
} 

> In the example above, we use the `NaN` function to generate a `NAN` value.

What is the Tanh function in Golang?

The Tanh function in Go computes the hyperbolic tangent, requiring a float64 argument and returning a float64 between -1 and +1, except for NAN inputs.