Function cos

deps/v8/test/mjsunit/sin-cos.js:100–111

(x)

}

function cos(x) {
  var sign = -1;
  var x2 = x*x;
  x = x2;
  var terms = [1];
  for (var i = 2; i < accuracy; i += 2) {
    terms.push(sign * x / factorial[i]);
    x *= x2;
    sign *= -1;
  }
  return precision_sum(terms);
}

function abs_error(fun, ref, x) {
  return Math.abs(ref(x) - fun(x));