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y=sinx+cosx =√2(√2/2*sinx+√2/2*cosx) =√2(cos45°sinx+sin45°cosx) =√2sin(x+45°) 當x∈[0.90°]時,x+45°∈[45°.135°] 當x+45°=45°時,y取到最小值1, 當x+45°=90°時,y取到最大值√2.
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