# Homework Help: Integration / substitution

1. May 29, 2009

### Zamael88

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

http://img20.imageshack.us/img20/112/41590752.jpg [Broken]

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.

Last edited by a moderator: May 4, 2017
2. May 29, 2009

### 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.

3. May 29, 2009

### Zamael88

Thank you. Now I understand. :)