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OCW Scholar - Multivariable Calculus 23 Online
OpenStudy (anonymous):

Section 2: Partial Derivatives - Supplemental Problems - Question 2D-9: I don't understand "estimate Deltas using unit distance" then the answer guide comes up with seemingly random numbers deltas=1/2, deltas=5/3 etc. purely looking on the level set. Can anybody explain this?

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