text: /* */ 
  var $def = require("./$.def"),
      expm1 = require("./$.expm1"),
      exp = Math.exp;
  $def($def.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));
    }});
  