The derivative of *f *at c is given as

assuming the limit exists.

Proof:

The derivative of *f *at *c *is given as

Let . It follows that as . Thus, substituting for :

Q.E.D.

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The derivative of *f *at c is given as

assuming the limit exists.

Proof:

The derivative of *f *at *c *is given as

Let . It follows that as . Thus, substituting for :

Q.E.D.

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