5. We want to evaluate dr dy. (z + y)ª A sketch of the solution is below. Identify one issue with this evaluation.(Hint: see section 7.8 in Stewart). Then carry out a similar method to find dy dr. (포+ y)" (You do not need to fix the 7.8 issue you identified.) You should get instead of – Why does this not follow Fubini's Theorem? (Why doesn't it meet the hypotheses?)

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