allimonster
New member
- Joined
- Jan 15, 2018
- Messages
- 2
Hi all!
I've been having some problems with a certain problem that has an integral in it; it seems like there are two ways to substitute u in, and they come out with different answers. Could someone look over my work and see if there is a calculation issue or a concept I'm overlooking that would make one of them incorrect?
This is the original problem:
By defining u as
you can go through the process of u substitution and end up with:
However, I noticed that you could go through the same process but instead use
and substituting that in multiple places:
Is there a technical problem with the second method? The answers are obviously different, but is there a reason to use one over the other? Which one is correct? Or have I just made an error somewhere?
Thank you for your help!
I've been having some problems with a certain problem that has an integral in it; it seems like there are two ways to substitute u in, and they come out with different answers. Could someone look over my work and see if there is a calculation issue or a concept I'm overlooking that would make one of them incorrect?
This is the original problem:
By defining u as
you can go through the process of u substitution and end up with:
However, I noticed that you could go through the same process but instead use
and substituting that in multiple places:
Is there a technical problem with the second method? The answers are obviously different, but is there a reason to use one over the other? Which one is correct? Or have I just made an error somewhere?
Thank you for your help!