# JavaScript | Math.tanh() function

The Math.tanh() is an inbuilt function in JavaScript which is used to calculate the value of hyperbolic tangent of a number.
Syntax:

`Math.tanh(p)`

Parameter: This function accepts a single parameter p which is a number for which the value of hyperbolic tangent is going to be calculated.

Return value: It returns the calculated value of the hyperbolic tangent of the number.

Examples:

```Input :Math.tanh(0)
Output:0```

Explanation:
Here formula for calculating hyperbolic tangent of any number is : The number e is a mathematical constant having an approximate value equal to 2.718. In the same way hyperbolic tangent of any number can be calculated just after replacing p with the desired number.

```Input :Math.tanh(18)
Output:0.9999999999999996```

Explanation:
Here same as above calculation, when we put 18 instead of p then the value becomes as output shown above.
Let’s see some JavaScript code:

• Example 1:

 ` `

Output:

```0
0.7615941559557649
0.9999092042625951
1
-0.9640275800758169
0.999329299739067```
• Example 2: It is an error case because complex number can not be taken as the parameter of the function only integer value can be taken as the parameter.

 ` `

Output:

`Error: Invalid or unexpected token`
• Example 3: Other than integer nothing is accepted as the parameter of the function that is why here string as the parameter gives NaN i.e, not a number.

 `

Output:

```NaN
NaN```

Application: Its practical application is that whenever we need to find the value of the hyperbolic tangent of a number that time we take the help of Math.tanh() function in JavaScript.

• Example:

 `

Output:

```0
0.7615941559557649
0.9640275800758169
0.9950547536867305
0.999329299739067
0.9999092042625951
0.9999877116507956
0.9999983369439447
0.9999997749296758
0.999999969540041```

Supported Browsers: The browsers supported by JavaScript Math.tanh() function are listed below:

• Internet Explorer
• Firefox
• Opera
• Safari

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