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24 lines
704 B
JavaScript
24 lines
704 B
JavaScript
var $ = require('../internals/export');
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var log1p = require('../internals/math-log1p');
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var nativeAcosh = Math.acosh;
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var log = Math.log;
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var sqrt = Math.sqrt;
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var LN2 = Math.LN2;
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var FORCED = !nativeAcosh
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// V8 bug: https://code.google.com/p/v8/issues/detail?id=3509
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|| Math.floor(nativeAcosh(Number.MAX_VALUE)) != 710
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// Tor Browser bug: Math.acosh(Infinity) -> NaN
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|| nativeAcosh(Infinity) != Infinity;
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// `Math.acosh` method
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// https://tc39.github.io/ecma262/#sec-math.acosh
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$({ target: 'Math', stat: true, forced: FORCED }, {
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acosh: function acosh(x) {
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return (x = +x) < 1 ? NaN : x > 94906265.62425156
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? log(x) + LN2
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: log1p(x - 1 + sqrt(x - 1) * sqrt(x + 1));
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}
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});
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