# Homework Help: Help with Taylor series

1. May 13, 2014

### rmc240

I'm reading a derivation and it says that the following approximation can be used:

I do not under stand how Taylor's theorem allows for this approximation. Can any one explain this a little?

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2. May 13, 2014

### LCKurtz

If you let $f(r) = \frac{dv}{dr}$ you have $f(r+dr) = f(r) + f'(r)dr$. Do you recognize that?

3. May 14, 2014

### rmc240

Yea, my problem was realizing that I was supposed to approximate the function around r and evaluate the function at r + dr. Should have seen that. Thank you for your help.