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I was working through a chapter on Lagrangians when I cam across this:

"Using a Taylor expansion, the potential can be approximated as

## V(x+ \epsilon) \approx V(x)+\epsilon \frac{dV}{dx} ##"

Now this looks nothing like any taylor expansion i've seen before. I'm used to

## f(x) = \sum\frac{f^{(i)}(a)(x-a)^i}{i!} ##

What am I missing here?

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# Strange invocation of Taylor series

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