calculate white noise why is covariance zero what is the equation for the expected white noise in terms of cost and covariance? why would there be zero covariance? why does covariance go zero if the econ is zero why would the equation for the covariance of an equation be zero? why would the covariance be 0? why is there covariance 0 why does it take a zero kb in covariance why does the covariance formula in the white noise equation go to zero how to find the covariance why would covariance be zero white noise why do we have zero covariance in ns what is covariance? why would covariance be 0 for a non-strictly stationary process? when a covariance is negative, the value of 0 is how to find covariance what is the value of the covariance what is the covariance of a non-stationary process calculating covariance in a nonstationary white noise process