aaac7fed
 liuqimichale
add
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"use strict";
var exp = Math.exp;
module.exports = function (value) {
if (isNaN(value)) return NaN;
value = Number(value);
if (value === 0) return 1;
if (!isFinite(value)) return Infinity;
return (exp(value) + exp(-value)) / 2;
};
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