$$\frac { \sqrt { 1 } } { \sqrt { 2 } }$$
$\frac{\sqrt{2}}{2}\approx 0.707106781$
$$\frac{1}{\sqrt{2}}$$
$$\frac{\sqrt{2}}{\left(\sqrt{2}\right)^{2}}$$
$$\frac{\sqrt{2}}{2}$$
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