Задача 60170 ...

60bdd73aa1c50e1d3043c41e

07.06.2021 11:23:15

2cos3x ≤ 1

5f3ea7e3faf909182968ddd9

07.06.2021 15:27:25

★

[m]cos3x ≤ \frac{1}{2}[/m]


[m]\frac{π}{3}+2πn ≤ 3x ≤ \frac{5π}{3}+2πn, n ∈ [/m][b]Z[/b]

[m]\frac{π}{9}+\frac{2π}{3}n ≤ x ≤ \frac{5π}{9}+\frac{2π}{3}n, n ∈ [/m][b]Z[/b]