设y是x的函数,[sec(x+y)]^2=0两边对x求导数等于

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设y是x的函数,[sec(x+y)]^2=0两边对x求导数等于
设y是x的函数,[sec(x+y)]^2=0两边对x求导数等于

设y是x的函数,[sec(x+y)]^2=0两边对x求导数等于
很高兴为您
[sec(x+y)]^2=0两边对x求导数为
2sec(x+y)sec(x+y)tan(x+y)(1+dy\dx)=0
即为2[sec(x+y)]^2tan(x+y)(1+dy\dx)=0
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这题没什么意思
[sec(x+y)]^2=0,sec(x+y)=0,x+y=常数,y'=-1