$${ \left(5 \times +2Y+3Z \right) }^{ 2 }$$
$\left(10Y+3Z\right)^{2}$
$$\left(10Y+3Z\right)^{2}$$
$$100Y^{2}+60YZ+9Z^{2}$$
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$100Y^{2}+60YZ+9Z^{2}$
