$$\left. \begin{array} { l } { ( 2 m + 1 ) ^ { 2 } } \\ { ( x + 4 ) ( x - 4 ) } \end{array} \right.$$
$\left(x^{2}-16\right)\left(2m+1\right)^{2}$
$$x^{2}-16=\left(x-4\right)\left(x+4\right)$$
$$\left(x-4\right)\left(x+4\right)\left(2m+1\right)^{2}$$
$$4m^{2}x^{2}+4mx^{2}+x^{2}-64m^{2}-64m-16$$
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$\left(2m+1\right)^{2},\ x^{2}-16$
