1// 20.2.2.33 Math.tanh(x)
2var $export = require('./_export');
3var expm1 = require('./_math-expm1');
4var exp = Math.exp;
5
6$export($export.S, 'Math', {
7  tanh: function tanh(x) {
8    var a = expm1(x = +x);
9    var b = expm1(-x);
10    return a == Infinity ? 1 : b == Infinity ? -1 : (a - b) / (exp(x) + exp(-x));
11  }
12});
13