$$- \sqrt{ 3/2 } +1/2$$
$\frac{1-\sqrt{6}}{2}\approx -0.724744871$
$$-\frac{\sqrt{3}}{\sqrt{2}}+\frac{1}{2}$$
$$-\frac{\sqrt{3}\sqrt{2}}{\left(\sqrt{2}\right)^{2}}+\frac{1}{2}$$
$$-\frac{\sqrt{3}\sqrt{2}}{2}+\frac{1}{2}$$
$$-\frac{\sqrt{6}}{2}+\frac{1}{2}$$
$$\frac{\sqrt{6}+1}{2}$$
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$\frac{1 - \sqrt{6}}{2} = -0.7247448713915889$