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令2X+π|3=T 因為x∈【0,π/2】 所以0《2X《π π/3《2X+π|3《4π/3 所以π/3《T《4π/3 Y=2cosT(π/3《T《4π/3) 由Y=COSX的影像知 Y=cosT T∈【π/3,4π/3】 的取值範圍是【-1,½;】 由此可知Y=2cosT +1的取值範圍是【-1,2】
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