Integrating Factor, how do you get this?

*flyingpig*

1. The problem statement, all variables and given/known data

My book shows that

and then they arrived at the results

So my problem is that, how exactly did they drop the mu in the first picture?

flyingpig	Integrating Factor, how do you get this? 1. The problem statement, all variables and given/known data My book shows that and then they arrived at the results So my problem is that, how exactly did they drop the mu in the first picture?