y=x^2 sec x和y=2x/1-x^2求导数的详细步骤?教教我吧.
问题描述:
y=x^2 sec x和y=2x/1-x^2求导数的详细步骤?教教我吧.
答
y'=(x^2)'secx+x^2(secx)'
=2secx*x+x^2*secx*tanx
y'=2x((1-x)^-2)'+(2x)'/(1-x)^2
= 4x/(1-x)^3 -2/(1-x)^2
=(6x-2)/(1-x)^3