14 lines
484 B
JavaScript
14 lines
484 B
JavaScript
// 20.2.2.3 Math.acosh(x)
|
|
var $export = require('./$.export')
|
|
, log1p = require('./$.math-log1p')
|
|
, sqrt = Math.sqrt
|
|
, $acosh = Math.acosh;
|
|
|
|
// V8 bug https://code.google.com/p/v8/issues/detail?id=3509
|
|
$export($export.S + $export.F * !($acosh && Math.floor($acosh(Number.MAX_VALUE)) == 710), '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));
|
|
}
|
|
}); |