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- Homework Statement
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- Relevant Equations
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In the thermodynamics textbook there is written: πΏπ΄ =

How did we get the bolded area from

**πππ**β ππ =**π(ππ) β πππ**β ππ = βπ(π β ππ) β πππ = βππΉ β πππHow did we get the bolded area from

**TdS**? Is that property of derivative, integral, or something else :/