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1. The problem statement, all variables and given/known data

N/A

2. Relevant equations

f(x +Δx,y) = f(x,y) +∂f(x,y)/∂x*Δx

3. The attempt at a solution

Sorry this isn't really homework. We were given this equation today in order to derive the Taylor expansion formula in two variables and I'm not sure where it came from.It seems similar to the mean value theorem.

any help would be appreciated

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# Help understanding equation involving a partial derivative

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