若x=sinθ,θ∈[-π/6,2π/3],则y=cosx的值域为
1个回答
∵ θ∈[-π/6,2π/3],
∴ x=sinθ∈[-1/2,1]
∴ y=cosx∈【cos1,1】
即 y=cosx的值域为【cos1,1】
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