Question

\( 2\left(\begin{array}{ccc}y+z & x^{2} & x^{2} \\ y^{2} & (z+x)^{2} & y^{2} \\ z^{2} & z^{2} & (x+y)^{2}\end{array} \mid=2 x y(x+y+z)^{3}\right. \)