$$\frac{ton_{30}}{1-ton^{2}30^{\circ}}=?$$
$\frac{\sqrt{3}}{2}\approx 0.866025404$
$$\frac{\frac{\sqrt{3}}{3}}{1-\left(\tan(30)\right)^{2}}$$
$$\frac{\frac{\sqrt{3}}{3}}{1-\left(\frac{\sqrt{3}}{3}\right)^{2}}$$
$$\frac{\frac{\sqrt{3}}{3}}{1-\frac{\left(\sqrt{3}\right)^{2}}{3^{2}}}$$
$$\frac{\frac{\sqrt{3}}{3}}{1-\frac{3}{3^{2}}}$$
$$\frac{\frac{\sqrt{3}}{3}}{1-\frac{3}{9}}$$
$$\frac{\frac{\sqrt{3}}{3}}{1-\frac{1}{3}}$$
$$\frac{\frac{\sqrt{3}}{3}}{\frac{2}{3}}$$
$$\frac{\sqrt{3}\times 3}{3\times 2}$$
$$\frac{\sqrt{3}}{2}$$
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