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

Math.tanh() - JavaScript | MDN

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La funcion Math.tanh() devuelve la hyperbolica tangente de un numero, esto es

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

La hyperbolica tangente del numero obtenido.

Porque tanh() es un metodo estatico de Math, siempre se usa como Math.tanh(), en lugar de ser un metodo de Math objeto que creas (Math no es un constructor).

Math.tanh(0); // 0
Math.tanh(Infinity); // 1
Math.tanh(1); // 0.7615941559557649

Esto puede ser emulado con ayuda de Math.exp() funcion:

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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