Question

这道题的化简步骤是什么？

Answer 1

如坦碰袜图让激所吵橡示

Answer 2

y'历槐= [sec(x+y)]^2 (1+y')
y'数兆 - [sec(x+y)]^2.y' =[sec(x+y)]^2
{ 1-[sec(x+y)]^2 }.y'薯烂租 =[sec(x+y)]^2
y' =[sec(x+y)]^2/{ 1-[sec(x+y)]^2 }