JavaScript Math.tanh() Method

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The Math.tanh() method in JavaScript allows a numeric value as an argument and returns the hyperbolic tangent of that number. If we provide Infinity or -Infinity as an argument, this method returns 1 and -1, respectively. If a non-numeric or empty number is provided, it NaN as result.

Mathematically, the hyperbolic tangent function is defined as follows −

tanh(x) = (e^x - e^(-x)) / (e^x + e^(-x))

Where x is the input number, and e is the base of the natural logarithm (approximately equal to 2.71828).

Note: This method is not supported in Internet Explorer.

Syntax

Following is the syntax of JavaScript Math.tanh() method −

Math.tanh(x)

Parameters

This method accepts only one paramter. The same is described below −

  • x: A numeric value.

Return value

This method returns the hyperbolic tangent of the provided number.

Example 1

Following example demonstartes the basic usage of JavaScript Math.tanh() method −

<html>
<body>
<script>
   let number1 = Math.tanh(-1);
   document.write(number1, "<br>");

   let number2 = Math.tanh(0);
   document.write(number2, "<br>");

   let number3 = Math.tanh(1);
   document.write(number3);
</script>
</body>
</html>

Output

If we execute the above program, it returns the hyperbolic tangent for the provided numbers.

Example 2

Here, we are using the Math.tanh() method with Infinity values −

<html>
<body>
<script>
   let number1 = Math.tanh(Infinity);
   document.write(number1, "<br>");

   let number2 = Math.tanh(-Infinity);
   document.write(number2);
</script>
</body>
</html>

Output

If we execute the above program, it returns (1) for Infinity and (-1) for -Infinity as result.

Example 3

If we try to calculate the hyperbolic tangent value of a non-numeric value or empty number, it returns NaN as result −

<html>
<body>
<script>
   let number1 = Math.tanh("Tutorialspoint");
   document.write(number1, "<br>");

   let number2 = Math.tanh();
   document.write(number2);
</script>
</body>
</html>

Output

As we can see in the output, the above program returned NaN.

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