$$\frac { 1 } { \sqrt { 2 } - \sqrt { 3 } }$$
$-\left(\sqrt{2}+\sqrt{3}\right)\approx -3.14626437$
$$\frac{\sqrt{2}+\sqrt{3}}{\left(\sqrt{2}-\sqrt{3}\right)\left(\sqrt{2}+\sqrt{3}\right)}$$
$$\frac{\sqrt{2}+\sqrt{3}}{\left(\sqrt{2}\right)^{2}-\left(\sqrt{3}\right)^{2}}$$
$$\frac{\sqrt{2}+\sqrt{3}}{2-3}$$
$$\frac{\sqrt{2}+\sqrt{3}}{-1}$$
$$-\sqrt{2}-\sqrt{3}$$
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