$$-9/2 \sqrt{ 3/4 }$$
$-\frac{9\sqrt{3}}{4}\approx -3.897114317$
$$-\frac{9}{2}\sqrt{\frac{3}{4}}$$
$$-\frac{9}{2}\times \frac{\sqrt{3}}{\sqrt{4}}$$
$$-\frac{9}{2}\times \frac{\sqrt{3}}{2}$$
$$\frac{-9\sqrt{3}}{2\times 2}$$
$$\frac{-9\sqrt{3}}{4}$$
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