$$(g\times\frac{2}{x})^{2}}$$
$4\times \left(\frac{g}{x}\right)^{2}$
$$\left(\frac{g\times 2}{x}\right)^{2}$$
$$\frac{\left(g\times 2\right)^{2}}{x^{2}}$$
$$\frac{g^{2}\times 2^{2}}{x^{2}}$$
$$\frac{g^{2}\times 4}{x^{2}}$$
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