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So let x = (sin θ) & sup2;, 0 °≤ θ ≤ 90 ° ∴y=sinθ+√3cosθ=2sin(θ+60°). ∵0°≤θ≤90°,∴60°≤θ+60°≤150°, ∴1≤2sin(θ+60°)≤2, Range [1,2]
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