1 // 20.2.2.3 Math.acosh(x)
2 var $export = require('./_export')
3 , log1p = require('./_math-log1p')
7 $export($export.S + $export.F * !($acosh
8 // V8 bug: https://code.google.com/p/v8/issues/detail?id=3509
9 && Math.floor($acosh(Number.MAX_VALUE)) == 710
10 // Tor Browser bug: Math.acosh(Infinity) -> NaN
11 && $acosh(Infinity) == Infinity
13 acosh: function acosh(x){
14 return (x = +x) < 1 ? NaN : x > 94906265.62425156
15 ? Math.log(x) + Math.LN2
16 : log1p(x - 1 + sqrt(x - 1) * sqrt(x + 1));