JavaScript Math tanh() Method

Last Updated : 12 Jul, 2024

Javascript Math.tanh() method is used to calculate the value of the hyperbolic tangent of a number.

Syntax:

Math.tanh(x)

Parameter: This method accepts a single parameter as mentioned above and described below:

x: 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.< Below example illustrate the Math.tanh() method in JavaScript:

Example: Here formula for calculating the hyperbolic tangent of any 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

Input :Math.tanh(0)
Output : 0

Example: In the same way hyperbolic tangent of any number can be calculated just after replacing p with the desired number. Here the same as the above calculation, when we put 18 instead of x then the value becomes as output shown above.

Input : Math.tanh(18)
Output : 0.9999999999999996

Example: Below is an example of the Math.tanh() Method.

javascript

// Printing hyperbolic tangent of some numbers
// taken as parameter 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));

Output

0
0.7615941559557649
0.9999092042625951
1
-0.9640275800758169
0.999329299739067

Example: It is an error case because the complex number can not be taken as the parameter of the function only integer value can be taken as the parameter.

javascript

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

Output:

Error: Invalid or unexpected token

Example: Other than integer nothing is accepted as the parameter of the function which is why here string as the parameter gives NaN i.e, not a number.

javascript

// 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

Example: 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.

javascript

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

Output

0
0.7615941559557649
0.9640275800758169
0.9950547536867305
0.999329299739067
0.9999092042625951
0.9999877116507956
0.9999983369439447
0.9999997749296758
0.999999969540041

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