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Trying to understand the magical number of e?

Asked by inunsure (423points) November 7th, 2011

I’m getting a little confused with how this book explains e.

They say the derivative of 2^x when x=0 is 0.693, umm maybe I’m really dumb but when I try this with wolfram alpha I get 0

http://www.wolframalpha.com/input/?i=d%2Fdx+2%5E0+

If you could answer this I had a few more questions

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