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So, I have the answer but I don't know how the question got from the start to end.

I've tried different ways but get stuck. I don't know how to rearrange the function to make an easy u substitution.

http://img713.imageshack.us/img713/7367/screenshot20111028at200.png [Broken]

I've tried different ways but get stuck. I don't know how to rearrange the function to make an easy u substitution.

http://img713.imageshack.us/img713/7367/screenshot20111028at200.png [Broken]

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