// 20.2.2.7 Math.atanh(x) var $export = require('./_export') , $atanh = Math.atanh; // Tor Browser bug: Math.atanh(-0) -> 0 $export($export.S + $export.F * !($atanh && 1 / $atanh(-0) < 0), 'Math', { atanh: function atanh(x){ return (x = +x) == 0 ? x : Math.log((1 + x) / (1 - x)) / 2; } });