## Trigonometry (10th Edition)

$\tan$240^{\circ} = $\sqrt3$ $\cot$240^{\circ} = $\frac{\sqrt3}{3}$
240^{\circ} We must use the reference angle of the given angle to determine the trigonometric functions. The reference angle of $\tan$240^{\circ} = $\frac{-\sqrt3}{-1}$ = $\sqrt3$ $\cot$240^{\circ} = $\frac{-1}{-\sqrt3}$ = $\frac{1}{\sqrt3}$ = $\frac{\sqrt3}{3}$