$$\frac{2}{\sqrt{3}-\sqrt{5}}$$
$-\left(\sqrt{3}+\sqrt{5}\right)\approx -3.968118785$
$$\frac{2\left(\sqrt{3}+\sqrt{5}\right)}{\left(\sqrt{3}-\sqrt{5}\right)\left(\sqrt{3}+\sqrt{5}\right)}$$
$$\frac{2\left(\sqrt{3}+\sqrt{5}\right)}{\left(\sqrt{3}\right)^{2}-\left(\sqrt{5}\right)^{2}}$$
$$\frac{2\left(\sqrt{3}+\sqrt{5}\right)}{3-5}$$
$$\frac{2\left(\sqrt{3}+\sqrt{5}\right)}{-2}$$
$$-\left(\sqrt{3}+\sqrt{5}\right)$$
$$-\sqrt{3}-\sqrt{5}$$
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