Integration / substitution

[Zamael88]

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

http://img20.imageshack.us/img20/112/41590752.jpg

2. Relevant equations



3. The attempt at a solution

I have no idea how to convert the left equation into the right one.

Could someone show me how to do that?

I don't understand why the right equation should be multiplied by 1/2

It is really giving me a headache.

Thanks for reading this post.

[djeitnstine]

substitute u=1 + \mu^2 therefore du=2 \mu d \mu the half comes in becuase you have to solve for \mu d \mu which is in the numerator, it becomes \frac{1}{2}du= \mu dx

since this the HW forum you should be able to see the rest.

[Zamael88]

Thank you. Now I understand. :)