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[单选题]
y=e-x cos(3-x),则dy=()。
A.e-x[cos(3-x)-sin(3-x)]dx
B.-e-x[cos(3-x)-sin(3-x)]dx
C.-e-x[cos(3-x)+sin(3-x)]dx
D.-e-xsin(3-x)dx
提问人:网友文旻昊
发布时间:2022-08-10
A.e-x[cos(3-x)-sin(3-x)]dx
B.-e-x[cos(3-x)-sin(3-x)]dx
C.-e-x[cos(3-x)+sin(3-x)]dx
D.-e-xsin(3-x)dx
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