Thread: Formal derivative
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Old November 13th, 2008, 12:45 PM
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Quote:
Originally Posted by Laurent View Post
This is given by the usual formula: \frac{X^k-z^k}{X-z}=X^{k-1}+zX^{k-2}+\cdots+z^{k-2}X+z^{k-1}. And now, substitute.
Thanks for your help, but may I ask what formula did we use here?
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