sin(2π/3+λ)=1/2,0
问题描述：
sin(2π/3+λ)=1/2,0
答
0≤λ＜π
2π/3≤2π/3+λ＜5π/3
sin(2π/3+λ)=1/2
2π/3+λ=5π/6
所以λ=π/6
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