A.sin(x2y) B.x2sin(x2y) C.-sin(x2y) D

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问题 A.sin(x2y)B.x2sin(x2y)C.-sin(x2y)D.-x2sin(x2y)

选项 A.sin(x2y)
B.x2sin(x2y)
C.-sin(x2y)
D.-x2sin(x2y)

答案 D

解析
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