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12 lines
206 B
JavaScript
12 lines
206 B
JavaScript
'use strict';
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var exp = Math.exp;
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module.exports = function (x) {
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if (isNaN(x)) return NaN;
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x = Number(x);
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if (x === 0) return 1;
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if (!isFinite(x)) return Infinity;
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return (exp(x) + exp(-x)) / 2;
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};
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