$$\sqrt{ 1/6/7 \times 4 }$$
$\frac{\sqrt{42}}{21}\approx 0.3086067$
$$\sqrt{\frac{1}{6\times 7}\times 4}$$
$$\sqrt{\frac{1}{42}\times 4}$$
$$\sqrt{\frac{4}{42}}$$
$$\sqrt{\frac{2}{21}}$$
$$\frac{\sqrt{2}}{\sqrt{21}}$$
$$\frac{\sqrt{2}\sqrt{21}}{\left(\sqrt{21}\right)^{2}}$$
$$\frac{\sqrt{2}\sqrt{21}}{21}$$
$$\frac{\sqrt{42}}{21}$$
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