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