JavaScript | Math.tanh() function

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:

Here the parameter p 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.
$tanh(p) = sinh(p)/cosh(p) = e^p-e^-p/e^p+e^-p = e^0-e^-0/e^0+e^-0 = 0$
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:

// Printing hyperbolic tangent of some numbers 
// taken as paramter of Math.tanh() function. 
console.log(Math.tanh(0)); 
console.log(Math.tanh(1)); 
console.log(Math.tanh(5)); 
console.log(Math.tanh(22)); 
console.log(Math.tanh(-2)); 
console.log(Math.tanh(4)); 

/div>

Output:

> 0
> 0.7615941559557649
> 0.9999092042625951
> 1
> -0.9640275800758169
> 0.999329299739067

Errors and Exceptions:
1. 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.

// complex number can not be calculated as the hyperbolic tangent. 
console.log(Math.tanh(1 + 2i)); 

Output:

Error: Invalid or unexpected token

2. 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.

// Any string value as the parameter of the function 
// gives NaN i.e, not a number 
// because only number can be used as the parameters. 
console.log(Math.tanh("geeksforgeeks")); 
console.log(Math.tanh("gfg")); 

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.

// Printing hyperbolic tangent of some numbers from 0 to 9 
// taken as paramter of Math.tanh() function. 
for (i = 0; i < 10; i++) { 
    console.log(Math.tanh(i)); 
    +"<br>"; 
} 

Output:

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

JavaScript | Math.tanh() function

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