I am having trouble trying to prove this: " u=xy, v=xy and z=f(u,v),
x(∂z/∂x) - y(∂z/∂y)=(x-y)∂z/∂u " keep getting an answer of zero.
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That's because what you are trying to prove isn't true! I suspect that u was supposed to be x/y, not xy.
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