1 var $ = require('../internals/export');
2 var expm1 = require('../internals/math-expm1');
7 // https://tc39.github.io/ecma262/#sec-math.tanh
8 $({ target: 'Math', stat: true }, {
9 tanh: function tanh(x) {
10 var a = expm1(x = +x);
12 return a == Infinity ? 1 : b == Infinity ? -1 : (a - b) / (exp(x) + exp(-x));