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I'm looking to compute the following expression:

[tex]

\int \left((\frac{\pat f(x,y)}{\pat x})^{2}+(\frac{\pat f(x,y)}{\pat y})^{2}\right)dxdy

[/tex]

any body could help me or there is well-known formula for this expression?

thanks,

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# Homework Help: Help on calculus od Partial Differential Expression

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