34) and (14.35):
Equation (14.34): $dS = \left(\frac{\partial S}{\partial U}\right)_B dU + \left(\frac{\partial S}{\partial B}\right)_U dB$
Equation (14.35): $dU = T dS - P dV + \mu dB$
We want to calculate $\left(\frac{\partial S}{\partial U}\right)_B$, which
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