$$\left. \begin{array} { l } { - E x } \\ { \quad ( x + y + 2 z ) ^ { 2 } } \end{array} \right.$$
$Ex\left(x+y+2z\right)^{2}$
$$Ex\left(x+y+2z\right)^{2}$$
$$Ex^{3}+Exy^{2}+4Exyz+4Exz^{2}+2Eyx^{2}+4Ezx^{2}$$
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$-Ex,\ \left(x+y+2z\right)^{2}$
