Java Math tanh() method with Examples

• Last Updated : 06 Apr, 2018

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
```

My Personal Notes arrow_drop_up