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当x∈【0,2π/3】时,y=2sin(2x+π/3)的单调区间和值域.最好有解释,

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当x∈【0,2π/3】时,y=2sin(2x+π/3)的单调区间和值域.最好有解释,
x∈【0,2π/3】时,
2x+π/3∈【π/3,5π/3】
y=2sin(2x+π/3)
2x+π/3∈【π/3,π/2)和【3π/2,5π/3)时单调增,此时x∈【0,π/12),【7π/12,2π/3)
2x+π/3∈【π/2,3π/2)时单调减,此时x∈【π/12,7π/12)
单调增区间【0,π/12),【7π/12,2π/3)
单调减区间【π/12,7π/12)
2x+π/3=π/2时有最大值2
2x+π/3=3π/2时有最小值-2
值域【-2,2】