Prove the Chain Rule.
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Problem:
Prove that if g(x) is differentiable at a and f(x) is differentiable at g(a) then (f∘g)′(a)=f′(g(a))g′(a).
Prove that if g(x) is differentiable at a and f(x) is differentiable at g(a) then (f∘g)′(a)=f′(g(a))g′(a).