If u=3 x^2 yz + 5 x^2 y^2 + 4 z^4 then x∂u/∂x + y∂u/∂y + z ∂u/∂z =?si118yt118si (61) in steem • 4 years ago steem steemstem steemit-education knowledge steemeducation steemtrail stem