# StrictMath tanh() Method in Java

The java.lang.StrictMath.tanh() method is used to return the hyperbolic tan of a double value passed as parameter to the function. The hyperbolic tan of x is defined by the formula where e denotes the Euler’s number.

Syntax:

`public static double tanh(double x)`

Parameters: The function accepts a single parameter x of double type and refers to the value whose hyperbolic tangent equivalence is to be returned.

Return Values: This method returns a double value which is the hyperbolic tangent of x. The absolute value of exact tanh never exceeds 1. The following cases are considered:

• The function returns NaN if the argument is NaN.
• The function returns +1.0 and -1.0 for positive infinity and negative infinity respectively.
• The function returns zero with the same sign as the argument if the argument is zero

Examples:

```Input: 0.7853981633974483
Output: 0.6557942026326724

Input: 4.0
Output: 0.999329299739067
```

Below programs illustrate the java.lang.StrictMath.tanh() method:
Program 1:

 `// Java Program to demonstrate tanh() ` `import` `java.io.*; ` `import` `java.math.*; ` `import` `java.lang.*; ` ` `  `class` `GFG { ` `    ``public` `static` `void` `main(String[] args) ` `    ``{ ` ` `  `        ``double` `x = (``45` `* Math.PI) / ``180``; ` ` `  `        ``// Display the hyperbolic tan of the value ` `        ``System.out.println(``"Hyperbolic tan of "` `                ``+ x + ``" = "` `+ StrictMath.tanh(x)); ` `    ``} ` `} `

Output:

```Hyperbolic tan of 0.7853981633974483 = 0.6557942026326724
```

Program 2:

 `// Java Program to illustrate  ` `// StrictMath.tanh() function  ` ` `  `import` `java.io.*; ` `import` `java.math.*; ` `import` `java.lang.*; ` ` `  `class` `GFG { ` `    ``public` `static` `void` `main(String[] args) ` `    ``{ ` ` `  `        ``double` `x1 = ``180` `/ (``0.0``), x2 = ``0``; ` ` `  `        ``// Display the hyperbolic tan of the values ` `        ``System.out.println(``"Hyperbolic tan of "` `               ``+ x1 + ``" = "` `+ StrictMath.tanh(x1)); ` `        ``System.out.println(``"Hyperbolic tan of "` `               ``+ x2 + ``" = "` `+ StrictMath.tanh(x2)); ` `    ``} ` `} `

Output:

```Hyperbolic tan of Infinity = 1.0
Hyperbolic tan of 0.0 = 0.0
```

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