$$458 \sqrt{ \frac{ 7 }{ 458 \times 7 } }$$
$\sqrt{458}\approx 21.400934559$
$$458\sqrt{\frac{7}{3206}}$$
$$458\sqrt{\frac{1}{458}}$$
$$458\times \frac{\sqrt{1}}{\sqrt{458}}$$
$$458\times \frac{1}{\sqrt{458}}$$
$$458\times \frac{\sqrt{458}}{\left(\sqrt{458}\right)^{2}}$$
$$458\times \frac{\sqrt{458}}{458}$$
$$\sqrt{458}$$
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