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Showing content from https://developer.mozilla.org/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/Math/tanh below:

Math.tanh() - JavaScript | MDN

Math.tanh()

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A função Math.tanh() retorna a tangente hiperbólica de um número, que é:

tanh x = sinh x cosh x = ex - e - x ex + e - x = e 2 x - 1 e 2 x + 1 \tanh x = \frac{\sinh x}{\cosh x} = \frac {e^x - e^{-x}} {e^x + e^{-x}} = \frac{e^{2x} - 1}{e^{2x}+1} Experimente 
console.log(Math.tanh(-1));
// Expected output: -0.7615941559557649

console.log(Math.tanh(0));
// Expected output: 0

console.log(Math.tanh(Infinity));
// Expected output: 1

console.log(Math.tanh(1));
// Expected output: 0.7615941559557649
Syntax Parameters Return value

Uma tangente hiperbólica de um número dado.

Description

Because tanh() is a static method of Math, you always use it as Math.tanh(), rather than as a method of a Math object you created (Math is not a constructor).

Examples Using Math.tanh() 
Math.tanh(0); // 0
Math.tanh(Infinity); // 1
Math.tanh(1); // 0.7615941559557649
Polyfill

This can be emulated with the help of the Math.exp() function:

Math.tanh =
  Math.tanh ||
  function (x) {
    var a = Math.exp(+x),
      b = Math.exp(-x);
    return a == Infinity ? 1 : b == Infinity ? -1 : (a - b) / (a + b);
  };
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