# Java Math tanh() method with Examples

The java.lang.Math.tanh() returns the hyperbolic tangent of a double value passed to it as argument. The hyperbolic tangent of any value a is defined as,

((ea – e-a)/2)/((ea + e-a)/2)

where e is Euler’s number. In other words, we can say that tanh(a) = sinh(a)/cosh(a).

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

Syntax :

```public static double tanh(double a)
Parameter :
a : the value whose hyperbolic tangent is to be returned.
```

Return :
This method returns the hyperbolic tangent value of the argument.

Example 1 : To show working of java.lang.Math.tanh() method.

 `// Java program to demonstrate working ` `// of java.lang.Math.tanh() method ` `import` `java.lang.Math; ` ` `  `class` `Gfg { ` ` `  `    ``// driver code ` `    ``public` `static` `void` `main(String args[]) ` `    ``{ ` ` `  `        ``double` `a = ``3.5``; ` ` `  `        ``System.out.println(Math.tanh(a)); ` ` `  `        ``a = ``90.328``; ` ` `  `        ``System.out.println(Math.tanh(a)); ` ` `  `        ``a = ``0``; ` `        ``// argument is zero, output will also be 0 ` `        ``System.out.println(Math.tanh(a)); ` `    ``} ` `} `

Output:

```0.9981778976111987
1.0
0.0
```

Example 2 : To show working of java.lang.Math.tanh() method when argument is NaN or infinity.

 `// Java program to demonstrate working ` `// of java.lang.Math.tanh() method infinity case ` `import` `java.lang.Math; ``// importing java.lang package ` ` `  `public` `class` `GFG { ` `    ``public` `static` `void` `main(String[] args) ` `    ``{ ` ` `  `        ``double` `positiveInfinity =  ` `               ``Double.POSITIVE_INFINITY; ` `        ``double` `negativeInfinity =  ` `               ``Double.NEGATIVE_INFINITY; ` `        ``double` `nan = Double.NaN; ` `        ``double` `result; ` ` `  `        ``// Here argument is negative infinity ` `        ``result = Math.tanh(negativeInfinity); ` `        ``System.out.println(result); ` ` `  `        ``// Here argument is positive infinity ` `        ``result = Math.tanh(positiveInfinity); ` `        ``System.out.println(result); ` ` `  `        ``// Here argument is NaN, output will be NaN ` `        ``result = Math.tanh(nan); ` `        ``System.out.println(result); ` `    ``} ` `} `

Output:

```-1.0
1.0
NaN
```

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