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解析:y=根號[ cos^4(x/2)- cosx]=根號[ cos^4(x/2)- 2cos²;(x/2)+1]=根號{[cos²;(x/2)-1]²;}=根號{[sin²;(x/2)]²;}=sin²;(x/2)=(1-cosx)/2所以可知函數的最小正週期為2π….
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