Evaluating trigonometric functions How would I evaluate cot 30 + cot 60? I know that cot 30 = 1/tan30 and cot60 = 1/tan60.
The answer must have a rational denominator where relevant.
I have tried adding them like normal fractions after evaluating, but got the incorrect answer. Any relevant online reading material would be appreciated thanks.

Well tan(a)=sin(a)/cos(a) So, you want cos(30)/sin(30) + cos(60)/sin(60) = $\frac{\sqrt{3}/2}{1/2} + \frac{1/2}{\sqrt{3}/2} = \sqrt{3} + \frac{1}{\sqrt{3}} = \frac{3}{\sqrt{3}}+\frac{1}{\sqrt{3}} = \frac{4}{\sqrt{3}} = \frac{4 * \sqrt{3}}{3}$
