y=2x/(1-x^2)导数?请写明计算过程

问题描述:

y=2x/(1-x^2)导数?请写明计算过程
答案是2(1+x^2)/(1-x^2)^2

y'=[2x/(1-x^2)]'
=[2x'(1-x^2)-2x*(1-2^x)']/(1-x^2)^2
=[2(1-x^2)+4x^2]/(1-x^2)^2
=2(1+x^2)/(1-x^2)^2