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Help in proof of chain rule

  1. Aug 10, 2011 #1
    From james stewart calculus Early Transcendentals.Before he states the proof he intoduced a property of differentiable funcion
    My problem is how we defined [itex]\epsilon[/itex] to be 0 when [itex]\Delta x[/itex]=0

    where this is not in the Domain.
  2. jcsd
  3. Aug 10, 2011 #2
    what is the problem???

    Like a piece wise Functions
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