Function d3_cosh

explainshell/web/static/js/d3.v3.js:1296–1298

(x)

    return (Math.exp(x) - Math.exp(-x)) / 2;
  }
  function d3_cosh(x) {
    return (Math.exp(x) + Math.exp(-x)) / 2;
  }
  function d3_haversin(x) {
    return (x = Math.sin(x / 2)) * x;
  }