z=arctan(xy)偏导数怎么求呢

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z=arctan(xy)偏导数怎么求呢z=arctan(xy)偏导数怎么求呢z=arctan(xy)偏导数怎么求呢∂z/∂x=[1/(1+(xy)²)]*y=y/(1

z=arctan(xy)偏导数怎么求呢
z=arctan(xy)偏导数怎么求呢

z=arctan(xy)偏导数怎么求呢
∂z/∂x=[1/(1+(xy)²)]*y=y/(1+x²y²)
∂z/∂y=[1/(1+(xy)²)]*x=x/(1+x²y²)

əz/əx=y/(1+x²y²)
əz/əy=x/(1+x²y²)