// 20.2.2.33 Math.tanh(x)
var $export = require('./$.export')
, expm1 = require('./$.math-expm1')
, exp = Math.exp;
$export($export.S, 'Math', {
tanh: function tanh(x){
var a = expm1(x = +x)
, b = expm1(-x);
return a == Infinity ? 1 : b == Infinity ? -1 : (a - b) / (exp(x) + exp(-x));
}
});