$$\frac{2+\sqrt{3}}{2-\sqrt{3}}$$
$4\sqrt{3}+7\approx 13.92820323$
$$\frac{\left(2+\sqrt{3}\right)\left(2+\sqrt{3}\right)}{\left(2-\sqrt{3}\right)\left(2+\sqrt{3}\right)}$$
$$\frac{\left(2+\sqrt{3}\right)\left(2+\sqrt{3}\right)}{2^{2}-\left(\sqrt{3}\right)^{2}}$$
$$\frac{\left(2+\sqrt{3}\right)\left(2+\sqrt{3}\right)}{4-3}$$
$$\frac{\left(2+\sqrt{3}\right)\left(2+\sqrt{3}\right)}{1}$$
$$\left(2+\sqrt{3}\right)\left(2+\sqrt{3}\right)$$
$$\left(2+\sqrt{3}\right)^{2}$$
$$4+4\sqrt{3}+\left(\sqrt{3}\right)^{2}$$
$$4+4\sqrt{3}+3$$
$$7+4\sqrt{3}$$
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