Z=eusin v,而u=xy,v=x+y,则

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问题 Z=eusin v,而u=xy,v=x+y,则

选项 A、exy[ysin(x+y)+cos(x+y)]
B、exy[xsin(x+y)一cos(x+y)]
C、exy[ysin(x+y)一cos(x+y)]
D、exy[xsin(x+y)+cos(x+y)]

答案A

解析
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