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∵函數y=sin(x+q)(0≤q≤派)是R上的偶函數 那麼曲線與y軸交點為最高點或最低點 ∴x=0時,y取得最值 將x=0代入 sinq=±1 ∴q=kπ+π/2,k∈Z ∵0≤q≤派 ∴k=0, q=π/2
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