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f(x)=√3sinx+cos2x=√3sinx+(1-2sin²;x)=-2sin²;x+√3sinx+1=-2(sinx-√3/4)²;+1+3/8=-2(sinx-√3/4)²;+11/8-1≤sinx≤1當sinx=√3/4時,取得最大值11/8;當sinx=-1時,取得最小值-2*(-1-√3/4) 178…
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