y=sin^2*1/x求y"
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y=sin^2*1/x求y"y=sin^2*1/x求y"y=sin^2*1/x求y"2sin(1/x)cos(1/x)*(-1/x^2)先一阶导数求导,有三步:1,令t=sin1/x,对t^2求导;2
y=sin^2*1/x求y"
y=sin^2*1/x求y"
y=sin^2*1/x求y"
2sin(1/x)cos(1/x)*(-1/x^2)
先一阶导数求导,有三步:1,令t=sin 1/x,对t^2求导;2,令u=1/x,对sin u求导;3,对1/x求导。一阶导数结果为(-1/x^2)*(sin 2/x),,,求二阶就再进行一次复合函数求导就行了。。。
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