$$( \sqrt { 5 } - \sqrt { 3 } ) ^ { 2 }$$
$8-2\sqrt{15}\approx 0.254033308$
$$\left(\sqrt{5}\right)^{2}-2\sqrt{5}\sqrt{3}+\left(\sqrt{3}\right)^{2}$$
$$5-2\sqrt{5}\sqrt{3}+\left(\sqrt{3}\right)^{2}$$
$$5-2\sqrt{15}+\left(\sqrt{3}\right)^{2}$$
$$5-2\sqrt{15}+3$$
$$8-2\sqrt{15}$$
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$8-2\sqrt{15}$