Question: Exercise 5.2.4. Follow these steps to provide a slightly modified proof of theChain Rule.(a) Show that a function h:ARis differentiable at ainA if and only

Exercise 5.2.4. Follow these steps to provide a slightly modified proof of theChain Rule.(a) Show that a function h:ARis differentiable at ainA if and only ifthere exists a function l:AR which is continuous at a and satisfiesh(x)-h(a)=l(x)(x-a), for all xinA

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