Answer
a) $\frac{\pi}{4}$ b) $\frac{-\pi}{3}$ c) $\frac{\pi}{6}$
Work Step by Step
a) Need to caculate the value of a trigonometric funtion $tan$.
$tan(\frac{\pi}{4})=1$
b) Need to caculate the value of a trigonometric funtion $tan$.
$tan(\frac{-\pi}{3})=-\sqrt 3$
c) Need to caculate the value of a trigonometric funtion $tan$.
$tan(\frac{\pi}{6})=\frac{1}{\sqrt 3}$
Hence, our answers are
a) $\frac{\pi}{4}$ b) $\frac{-\pi}{3}$ c) $\frac{\pi}{6}$