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## Homework Statement

I have no idea if this is a maths or EE problem, but is it possible to obtain the second line the expression for [tex]t_{PHL2}[/tex] from the first one, given the instructions for integration. I tried but didn't manage to get it.

http://img352.imageshack.us/img352/7459/cmosphl2sf2.jpg

## Homework Equations

## The Attempt at a Solution

In particular I can't seem to make Kn disappear inside the ln expression.

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