| 1 | var $ = require('../internals/export');
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| 2 | var log1p = require('../internals/math-log1p');
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| 3 |
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| 4 | var nativeAcosh = Math.acosh;
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| 5 | var log = Math.log;
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| 6 | var sqrt = Math.sqrt;
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| 7 | var LN2 = Math.LN2;
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| 8 |
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| 9 | var FORCED = !nativeAcosh
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| 10 |
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| 11 | || Math.floor(nativeAcosh(Number.MAX_VALUE)) != 710
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| 12 |
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| 13 | || nativeAcosh(Infinity) != Infinity;
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| 14 |
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| 15 |
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| 16 |
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| 17 | $({ target: 'Math', stat: true, forced: FORCED }, {
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| 18 | acosh: function acosh(x) {
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| 19 | return (x = +x) < 1 ? NaN : x > 94906265.62425156
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| 20 | ? log(x) + LN2
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| 21 | : log1p(x - 1 + sqrt(x - 1) * sqrt(x + 1));
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| 22 | }
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| 23 | });
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