Problem with a taylor serie expansion

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The forum discussion centers on a problem related to Taylor series expansion, specifically addressing the calculation of the mixed partial derivative fxy. The user initially disagreed with a proposed solution, asserting that their calculation of fxy resulted in the expression xyexy. Upon further review, the user acknowledged their error, confirming that f(0,1)=0 and that the term x(y-1) should not be included in the solution. This highlights the importance of accurate calculations in mathematical problem-solving.

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Amaelle
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Greetings
https://www.physicsforums.com/attachments/295843

I really don´t agree with the solution
https://www.physicsforums.com/attachments/295846

as I calculated fxy I got
fxy=xyexy
f(0,1)=0 so x(y-1) should not appear in the solution
am I wrong?

thank you!
 
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thank you I solved the problem it was my wrong calculation!
 

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