设y=xcosx;求(d^2y)/(dx^2)
1个回答
都忘了差不多了.
y=xcosx
y/x=cosx
d(y/x)=dcosx=1?
(d^2y)/(dx^2)
=1/2*d(y/x)
=1/2?
我不确定了,好几年没接触数学了
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