A.-6ycos(x-3y2) B.-6ysin(x-3y2) C.6yco

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问题 A.-6ycos(x-3y2)B.-6ysin(x-3y2)C.6ycos(x-3y2)D.6ysin(x-3y2)

选项 A.-6ycos(x-3y2)
B.-6ysin(x-3y2)
C.6ycos(x-3y2)
D.6ysin(x-3y2)

答案 A

解析
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