t2-2t(1+t)In(1+t)求导

题目

t2-2t(1+t)In(1+t)求导

答案

[t2-2t(1+t)In(1+t)]'
=2t-2(1+t)In(1+t)-2tIn(1+t)-2t(1+t)*[1/(1+t)]
=-2(1+2t)In(1+t)