// 20.2.2.3 Math.acosh(x) var $export = require('./_export') , log1p = require('./_math-log1p') , sqrt = Math.sqrt , $acosh = Math.acosh; $export($export.S + $export.F * !($acosh // V8 bug: https://code.google.com/p/v8/issues/detail?id=3509 && Math.floor($acosh(Number.MAX_VALUE)) == 710 // Tor Browser bug: Math.acosh(Infinity) -> NaN && $acosh(Infinity) == Infinity ), 'Math', { acosh: function acosh(x){ return (x = +x) < 1 ? NaN : x > 94906265.62425156 ? Math.log(x) + Math.LN2 : log1p(x - 1 + sqrt(x - 1) * sqrt(x + 1)); } });