pi pi 3*pi 5*pi 5*pi 7*pi
[0, --) U (--, ----) U (----, ----) U (----, 2*pi]
6 4 4 6 4 4
$$x\ in\ \left[0, \frac{\pi}{6}\right) \cup \left(\frac{\pi}{4}, \frac{3 \pi}{4}\right) \cup \left(\frac{5 \pi}{6}, \frac{5 \pi}{4}\right) \cup \left(\frac{7 \pi}{4}, 2 \pi\right]$$
x in Union(Interval.Ropen(0, pi/6), Interval.open(pi/4, 3*pi/4), Interval.open(5*pi/6, 5*pi/4), Interval.Lopen(7*pi/4, 2*pi))
/ / pi\ / 7*pi \ /pi 3*pi\ /5*pi 5*pi\\
Or|And|0 <= x, x < --|, And|x <= 2*pi, ---- < x|, And|-- < x, x < ----|, And|---- < x, x < ----||
\ \ 6 / \ 4 / \4 4 / \ 6 4 //
$$\left(0 \leq x \wedge x < \frac{\pi}{6}\right) \vee \left(x \leq 2 \pi \wedge \frac{7 \pi}{4} < x\right) \vee \left(\frac{\pi}{4} < x \wedge x < \frac{3 \pi}{4}\right) \vee \left(\frac{5 \pi}{6} < x \wedge x < \frac{5 \pi}{4}\right)$$
((0 <= x)∧(x < pi/6))∨((x <= 2*pi)∧(7*pi/4 < x))∨((pi/4 < x)∧(x < 3*pi/4))∨((5*pi/6 < x)∧(x < 5*pi/4))