18 lines
573 B
JavaScript
18 lines
573 B
JavaScript
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// 20.2.2.3 Math.acosh(x)
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var $export = require('./_export')
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, log1p = require('./_math-log1p')
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, sqrt = Math.sqrt
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, $acosh = Math.acosh;
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$export($export.S + $export.F * !($acosh
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// V8 bug: https://code.google.com/p/v8/issues/detail?id=3509
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&& Math.floor($acosh(Number.MAX_VALUE)) == 710
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// Tor Browser bug: Math.acosh(Infinity) -> NaN
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&& $acosh(Infinity) == Infinity
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), 'Math', {
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acosh: function acosh(x){
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return (x = +x) < 1 ? NaN : x > 94906265.62425156
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? Math.log(x) + Math.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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