# Rules for Finding Derivatives - Whitman College

We start with the **derivative** of a power **function**, f(x) = xn. Here n is a number of any kind: integer, rational, positive, negative, even irrational, as in xπ. We have already computed some simple examples, so the formula should not be a complete surprise: d dx xn = nxn−1. It is not easy to show this is true for any n.

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