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In my course on physical transport processes time and again these type of equations, containing partial derivatives, appear:

But how do you actually calculate such an equation? I know how to take the partial derivative from a function like x²tz³.

Would it be that I am given a function like x²yz³ and then I just do it like so:

x²z³+ u*2xtz³ = D*1

Or how woould calculating with this equation look like?

Thank you for an answer! Regards, Vera

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# How do you actually calculate this...?

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