dz/dt=(xy)'+(sint)'
此处的‘表示对t求导
dz/dt=x'y+xy'+cost
=e^t*cost+e^t*(-sint)+cost
=e^t(cost-sint)+cost
不明白可追问
设z=xy+sint,而x=e^t,y=cost,求导数dz/dt
设z=xy+sint,而x=e^t,y=cost,求导数dz/dt
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数学人气:679 ℃时间:2020-05-08 22:46:42
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