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"use strict";
var log = Math.log, sqrt = Math.sqrt;
module.exports = function (value) {
if (isNaN(value)) return NaN;
value = Number(value);
if (value < 1) return NaN;
if (value === 1) return 0;
if (value === Infinity) return value;
return log(value + sqrt(value * value - 1));
};
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