(adsbygoogle = window.adsbygoogle || []).push({}); Weird double integral. Please help!!

its from thermodynamics...but i dont think you really need to understand thermodynamics to figure out whatmathtrick they used to get from the first integral to the second integral

http://img833.imageshack.us/img833/833/intek.png [Broken]

i have been looking at this equation for hours and cannotfigure out how that partial differential and the 'dT' just disappeared!!

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# Weird double integral. Please help

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