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f(x)=sin(2x+π/6)
π/2+2kπ=<2x+π/6<=3π/2+2kπ
π/3+2kπ=<2x<=4π/3+2kπ
π/6+kπ=<x<=2π/3+kπ
当k=-1时,x∈[-5π/6,-π/3]
选B
π/2+2kπ=<2x+π/6<=3π/2+2kπ
π/3+2kπ=<2x<=4π/3+2kπ
π/6+kπ=<x<=2π/3+kπ
当k=-1时,x∈[-5π/6,-π/3]
选B
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