$$\frac{\sqrt{5}-\sqrt{3}}{\sqrt{5}+\sqrt{3}}$$
$4-\sqrt{15}\approx 0.127016654$
$$\frac{\left(\sqrt{5}-\sqrt{3}\right)\left(\sqrt{5}-\sqrt{3}\right)}{\left(\sqrt{5}+\sqrt{3}\right)\left(\sqrt{5}-\sqrt{3}\right)}$$
$$\frac{\left(\sqrt{5}-\sqrt{3}\right)\left(\sqrt{5}-\sqrt{3}\right)}{\left(\sqrt{5}\right)^{2}-\left(\sqrt{3}\right)^{2}}$$
$$\frac{\left(\sqrt{5}-\sqrt{3}\right)\left(\sqrt{5}-\sqrt{3}\right)}{5-3}$$
$$\frac{\left(\sqrt{5}-\sqrt{3}\right)\left(\sqrt{5}-\sqrt{3}\right)}{2}$$
$$\frac{\left(\sqrt{5}-\sqrt{3}\right)^{2}}{2}$$
$$\frac{\left(\sqrt{5}\right)^{2}-2\sqrt{5}\sqrt{3}+\left(\sqrt{3}\right)^{2}}{2}$$
$$\frac{5-2\sqrt{5}\sqrt{3}+\left(\sqrt{3}\right)^{2}}{2}$$
$$\frac{5-2\sqrt{15}+\left(\sqrt{3}\right)^{2}}{2}$$
$$\frac{5-2\sqrt{15}+3}{2}$$
$$\frac{8-2\sqrt{15}}{2}$$
$$4-\sqrt{15}$$
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