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var $ = require('../internals/export');
var log1p = require('../internals/math-log1p');
// eslint-disable-next-line es-x/no-math-acosh -- required for testing
var $acosh = Math.acosh;
var log = Math.log;
var sqrt = Math.sqrt;
var LN2 = Math.LN2;
var FORCED = !$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` method
// https://tc39.es/ecma262/#sec-math.acosh
$({ target: 'Math', stat: true, forced: FORCED }, {
acosh: function acosh(x) {
var n = +x;
return n < 1 ? NaN : n > 94906265.62425156
? log(n) + LN2
: log1p(n - 1 + sqrt(n - 1) * sqrt(n + 1));
}
});