I am doing some integration drills and I am stuck with this one:

the solution is as follows:

Step 3:

What I don't understand is why was chosen as u? and how they got step number 3?

Any help is appreciated.

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- June 1st 2009, 10:48 AMcalc101Integration: 1/sqrt(9-4x^2)
I am doing some integration drills and I am stuck with this one:

the solution is as follows:

Step 3:

What I don't understand is why was chosen as u? and how they got step number 3?

Any help is appreciated. - June 1st 2009, 11:07 AMRandom Variable
Your'e missing something:

- June 1st 2009, 11:10 AMSpec

- June 1st 2009, 11:31 AMcalc101
I am sorry, I missed the

Random Variable, I dont see how you got to the last step, could you elaborate?

So, I understand this:

but to jump from that to this:

is what I do not understand? - June 1st 2009, 11:46 AMRandom Variable