phpjs/functions/math/cos.js

php.js offers community built php functions in javascript

function cos(arg) {
  // From: http://phpjs.org/functions
  // +   original by: Onno Marsman
  // *     example 1: cos(8723321.4);
  // *     returns 1: -0.18127180117605912
  return Math.cos(arg);
}