/ / / ____\\ / / ____\ \\
| | |\/ 91 || | |\/ 91 | ||
Or|And|0 <= t, t < atan|------||, And|t <= 2*pi, - atan|------| + 2*pi < t||
\ \ \ 3 // \ \ 3 / //
$$\left(0 \leq t \wedge t < \operatorname{atan}{\left(\frac{\sqrt{91}}{3} \right)}\right) \vee \left(t \leq 2 \pi \wedge - \operatorname{atan}{\left(\frac{\sqrt{91}}{3} \right)} + 2 \pi < t\right)$$
((0 <= t)∧(t < atan(sqrt(91)/3)))∨((t <= 2*pi)∧(-atan(sqrt(91)/3) + 2*pi < t))
/ ____\ / ____\
|\/ 91 | |\/ 91 |
[0, atan|------|) U (- atan|------| + 2*pi, 2*pi]
\ 3 / \ 3 /
$$x\ in\ \left[0, \operatorname{atan}{\left(\frac{\sqrt{91}}{3} \right)}\right) \cup \left(- \operatorname{atan}{\left(\frac{\sqrt{91}}{3} \right)} + 2 \pi, 2 \pi\right]$$
x in Union(Interval.Ropen(0, atan(sqrt(91)/3)), Interval.Lopen(-atan(sqrt(91)/3) + 2*pi, 2*pi))