Каковы народные предания о происхождении названий вашего края.

A)π/3+2πт≤2х+π/3≤5π/3+2πт
π/3-π/3+2πт≤2х≤5π/3-π/3+2πт
2πт≤2х≤4π/3+2πт
πт≤х≤2π/3+πт
х∈[πт;2π/3+πт]
b)sin(x-π/6)<1/2
π/6+2πn<x-π/6<13π/6+2πn
π/6+π/6+2πn<x<13π/6+π/6+2πn
π/3+2πn<x<7π/3+2πn
x∈(π/3+2πn;7π/3+2πn)
c)2sin4x≥√2
sin4x≥√2/2
π/4+2πn≤4x≤3π/4+2πn
π/16+πn/2≤x≤3π/16+πn/2
x∈[π/16+πn/2;3π/16+πn/2]
d)sinx≥-√2/2
-π/4+2πn≤x≤5π/4+2πn
x∈[-π/4+2πn;5π/4+2πn]