y=sin(x+y)的二阶导数怎么求?

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y=sin(x+y)的二阶导数怎么求?y=sin(x+y)的二阶导数怎么求?y=sin(x+y)的二阶导数怎么求?先两边同时对x求dao,得y''再对x求导,得y''''y''=cos(x+y){1+y''}y

y=sin(x+y)的二阶导数怎么求?
y=sin(x+y)的二阶导数怎么求?

y=sin(x+y)的二阶导数怎么求?
先两边同时对x求dao,得y'再对x求导,得y''
y'=cos(x+y){1+y'}
y'=cos(x+y)/{1-cos(x+y)}
再对x求dao,把y'de只带入记得