pi/6+2pik≤3x≤5pi/6+2pik-делю все на 3
pi/18+2pik/3≤x≤5pi/18+2pik/3
x=[pi/18+2pik/3;5pi/18+2pik/3;k∈Z]
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pi/6+2pik≤3x≤5pi/6+2pik-делю все на 3
pi/18+2pik/3≤x≤5pi/18+2pik/3
x=[pi/18+2pik/3;5pi/18+2pik/3;k∈Z]