Proof of the Quotient Rule Let F = f/g be the quotient of two functions that are differentiable at x.
a. Use the definition of F′ to show that
b. Now add −f(x)g(x) + f(x)g(x) (which equals 0) to the numerator in the preceding limit to obtain
Use this limit to obtain the Quotient Rule,
c. Explain why f′ = (f/g)′ exists, whenever g(x) ≠ 0.
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