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[单选题]
设cos(x+y)=4x,方程两边对x求导,可得()。
A.-sin(x+y)(1+y’)=4
B.-sin(1+y’)=4
C.-sin(x+y)=4
D.-sin(x+y)y’=4
提问人:网友Dume2021
发布时间:2022-01-07
A.-sin(x+y)(1+y’)=4
B.-sin(1+y’)=4
C.-sin(x+y)=4
D.-sin(x+y)y’=4
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