# Java.lang.StrictMath.tanh() Method

## Description

The java.lang.StrictMath.tanh() method returns the hyperbolic tangent of a double value. The hyperbolic tangent of x is defined to be (ex - e-x)/(ex + e-x).It include these cases −

• If the argument is NaN, then the result is NaN.
• If the argument is zero, then the result is a zero with the same sign as the argument.
• If the argument is positive infinity, then the result is +1.0.
• If the argument is negative infinity, then the result is -1.0.

## Declaration

Following is the declaration for java.lang.StrictMath.tanh() method

```public static double tanh(double x)
```

## Parameters

x − This is the number whose hyperbolic tangent is to be returned.

## Return Value

This method returns the hyperbolic tangent of x.

NA

## Example

The following example shows the usage of java.lang.StrictMath.tanh() method.

```package com.tutorialspoint;

import java.lang.*;

public class StrictMathDemo {

public static void main(String[] args) {

double d1 = (90*Math.PI)/180 , d2 = 0.0;
double d3 = (1.0)/(0.0), d4 = -(1.0)/(0.0);

// returns the hyperbolic trigonometric tangent of an angle.

double tanhValue = StrictMath.tanh(d1);
System.out.println("hyperbolic tangent of d1 = " + tanhValue);

tanhValue = StrictMath.tanh(d2);
System.out.println("hyperbolic tangent of d2 = " + tanhValue);

tanhValue = StrictMath.tanh(d3);
System.out.println("hyperbolic tangent of d3 = " + tanhValue);

tanhValue = StrictMath.tanh(d4);
System.out.println("hyperbolic tangent of d4 = " + tanhValue);
}
}
```

Let us compile and run the above program, this will produce the following result −

```hyperbolic tangent of d1 = 0.9171523356672744
hyperbolic tangent of d2 = 0.0
hyperbolic tangent of d3 = 1.0
hyperbolic tangent of d4 = -1.0
```
java_lang_strictmath.htm