z=arctan y/x;計算函數(shù)的偏導(dǎo)數(shù)
設(shè)連續(xù)函數(shù)f(x)滿足f(x)=lnx-
z=ex+y+yx2;計算函數(shù)的偏導(dǎo)數(shù)