$$\frac{2}{\sqrt{5+1}}$$
$\frac{\sqrt{6}}{3}\approx 0.816496581$
$$\frac{2}{\sqrt{6}}$$
$$\frac{2\sqrt{6}}{\left(\sqrt{6}\right)^{2}}$$
$$\frac{2\sqrt{6}}{6}$$
$$\frac{1}{3}\sqrt{6}$$
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