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π/6<=x+π/6<=13π/6
sin(x+π/6)≥1/2
所以π/6<=x+π/6<=5π/6,x+π/6=13π/6
所以0≤xπ/6≤2π/3,x=2π
sin(x+π/6)≥1/2
所以π/6<=x+π/6<=5π/6,x+π/6=13π/6
所以0≤xπ/6≤2π/3,x=2π
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