# Quick integration question

1. ### dowjonez

22
Doing a friction fluid denisty question and have to figure out why it cant be done.

d(1-v) / (1-v) = dt would integrate to ln |1-v| = t + c

now im faced with the same integration but the function has changed and now im staring a

d(1-v) / (1 - v^4) = dt is it possible to integrate that?

2. ### Tide

3,136
Yes. First, write $1-v^4$ as $(1-v^2)((1+v^2)$ then do a partial fraction decomposition. Also, rewrite d(1-v) as -dv and you should end up with something like

$-\frac {1}{2} \tan^{-1}v - \frac {1}{4}\frac{\ln v -1}{\ln v + 1}$