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【单选题】

设z=Eysinx,则
=()
A.-EyCosx
B.Ey+Eysinx
C.Ey-EyCosx
D.EyCosx

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根据网考网移动考试中心的统计,该试题:

3%的考友选择了A选项

3%的考友选择了B选项

10%的考友选择了C选项

84%的考友选择了D选项

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