<a href="http://www.codecogs.com/eqnedit.php?latex=\\cot30@plus;cot60\\\\ = \frac{1}{tan30}@plus;\frac{1}{tan60} \\= \frac{1}{\frac{1}{\sqrt{3}}}@plus;\frac{1}{\sqrt{3}} \\=\sqrt{3}@plus;\frac{1}{\sqrt{3}}\\=\frac{4}{\sqrt{3}} \\\frac{4}{\sqrt{3}}*\frac{\sqrt{3}}{\sqrt{3}} = \frac{4\sqrt{3}}{3}"...