- #1
raintrek
- 75
- 0
Homework Statement
Find [tex]\frac{dU_{ave}}{d\beta}[/tex]
where
[tex]U_{ave}=\sum_{k}\left(\frac{U_{k}exp(-U_{k}\beta)}{exp(-U_{k}\beta)}\right)[/tex]
Homework Equations
The Attempt at a Solution
My answer is supposed to be [tex]-(U_{ave}^{2})+(U_{ave})^{2}[/tex]
However I keep getting zero. I can only assume that the summation sign has something to do with the final form of the answer, but I have no idea how to deal with it. Can anyone offer a suggestion? Thanks