314

a)
-2\pi{,}\ -\pi{,}\ 0{,}\ \pi{,}\ 2\pi
b)
\tan x=1
x=\frac{\pi}{4}+n\cdot\pi
-\frac{7\pi}{4}{,}\ -\frac{3\pi}{4}{,}\ \frac{\pi}{4}{,}\ \frac{5\pi}{4}{,}\ \frac{9\pi}{4}