--- /dev/null
+// 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));
+ }
+});
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