es6.math.cosh.js 188 Bytes

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// 20.2.2.12 Math.cosh(x)
var $export = require('./_export')
  , exp     = Math.exp;

$export($export.S, 'Math', {
  cosh: function cosh(x){
    return (exp(x = +x) + exp(-x)) / 2;
  }
});