将函数y＝cos(2x－)的图象向右平移个单位长度，所得图象对应的函数

A．在区间［，］上单调递增

B．在区间［，π］上单调递减

C．在区间［，］上单调递增

D．在区间［，2π］上单调递减

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将函数y＝cos(2x－)的图象向右平移个单位长度，所得图象对应的函数

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