code: function complexDivideRealPart(a,b){
                  return (a[0]*b[0]+a[1]*b[1])/(b[0]*b[0]+b[1]*b[1]);
              }
docs: /*function complexDivide(a,b){
  return [ (a[0]*b[0]+a[1]*b[1])/(b[0]*b[0]+b[1]*b[1]),
  (a[1]*b[0]-a[0]*b[1])/(b[0]*b[0]+b[1]*b[1])];
  } We only need the real part here