$$(\frac{1}{2}x^{2}+3y+\frac{3}{4}z)^{2}4$$
$\frac{\left(2x^{2}+12y+3z\right)^{2}}{4}$
$x^{4}+3zx^{2}+12yx^{2}+18yz+\frac{9z^{2}}{4}+36y^{2}$
