So the expected value of our random variable X times our random variable Y minus, well I'll just do the X first. So plus X times the negative expected value of Y. So I'll just say minus X times the expected value of Y. And that negative sign comes from this negative sign right over here. And then we have minus expected value of X times Y minus the expected value of X times this Y. Just doing the distributed property twice. And then finally you have the negative expected value of X times the negative expected value of Y.