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var $ = require('../internals/export');
var expm1 = require('../internals/math-expm1');

// eslint-disable-next-line es/no-math-cosh -- required for testing
var $cosh = Math.cosh;
var abs = Math.abs;
var E = Math.E;

// `Math.cosh` method
// https://tc39.es/ecma262/#sec-math.cosh
$({ target: 'Math', stat: true, forced: !$cosh || $cosh(710) === Infinity }, {
  cosh: function cosh(x) {
    var t = expm1(abs(x) - 1) + 1;
    return (t + 1 / (t * E * E)) * (E / 2);
  }
});