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I have to show that the heat capacity can be expressed as

Cv = Nk(1+1/45(Om/T)^2 + ...)

where the internal energy is given as

E = NkT*(1-(Om/(3T)-1/45(Om/T)^2)

Normally I would just differentiate but if I do this I get something completely different - how to proceed any hints appreciated thanks in advance

Best regards

Magnus

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# Homework Help: Heat capacity from energy

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