Simple question about direct integration

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The discussion centers on the complexities of direct integration in calculus, particularly when dealing with equations that involve multiple variables. The user expresses confusion regarding the differentiation process with respect to both variables, xi and eta, especially when the derivative with respect to one variable still includes terms from the other. This highlights the intricacies of partial derivatives and their implications in multivariable calculus.

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Tuneman
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if I have a equation like this

img239.gif

I know I can integrate so that
img240.gif


but this does not make sense to me because I could think of many U's that if you were to take the derivative with respect to the squiggly varibale, still includes both variables
 
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If the derivative with respect to xi includes both variables, then how does it look when you differentiate with respect to both xi and to eta?
 
http://www.threepointstance.net/tpsbb/images/smilies/clever.gif
 
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