6a9ffbcc
 liuqimichale
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// 20.2.2.3 Math.acosh(x)
var $export = require('./_export');
var log1p = require('./_math-log1p');
var sqrt = Math.sqrt;
var $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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