Total Differential Homework Help

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The discussion revolves around confusion regarding the total differential and its integration. The user presents the equation dz=(∂z/∂x)dx+(∂z/∂y)dy and attempts to integrate both sides, leading to a contradiction in the form of z(x,y)= z(x)+z(y) + constant. Participants are encouraged to review the attached problem to identify the error in the integration process. The key issue appears to be misunderstanding how to properly integrate the total differential. Clarifying these concepts is essential for resolving the confusion.
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Homework Statement



I'm kind of confused with the total differential, because when i integrate it i get a contradiction, so i wonder if anyone could tell me what I'm doing wrong, please see the attachment to see my problem.
 

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dz=(∂z/∂x)dx+(∂z/∂y)dy

∫dz=∫(∂z/∂x)dx+∫(∂z/∂y)dy

which would give z(x,y)= z(x)+z(y) + constant
 
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