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'use strict';

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));

}

});