单项选择题
Z=e
u
sin v，而u=xy，v=x+y，则
A．e
xy
[ysin(x+y)+cos(x+y)]B．e xy [xsin(x+y)一cos(x+y)]
C．e xy [ysin(x+y)一cos(x+y)]
D．e xy [xsin(x+y)+cos(x+y)]
点击查看答案
( )
则当x→1时( )
单项选择题
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