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Viewing file:     es.math.tanh.js (388 B)      -rw-r--r--

var $ = require('../internals/export');
var expm1 = require('../internals/math-expm1');

var exp = Math.exp;

// `Math.tanh` method
// https://tc39.es/ecma262/#sec-math.tanh
$({ target: 'Math', stat: true }, {
  tanh: function tanh(x) {
    var n = +x;
    var a = expm1(n);
    var b = expm1(-n);
    return a == Infinity ? 1 : b == Infinity ? -1 : (a - b) / (exp(n) + exp(-n));
  }
});