$$x^{3}+(y+z)^{3}$$
$\left(x+y+z\right)\left(-x\left(y+z\right)+\left(y+z\right)^{2}+x^{2}\right)$
$x^{3}+y^{3}+3yz^{2}+z^{3}+3zy^{2}$
