Hi,

First post here

Anyway, I'm currently stuck on this question and I have no idea how to get any furfther, so I would really appreciate any help with it.

Differentiate using first principles:

f(x) = ln(1+e^x)

I've managed to get to this point:

f'(x) = lim(h -> 0) (ln((e^x+e^-h)/(e(^x)+1)))/h

But I don't know how to get rid of the log, or the h's for that matter.

Cheers, Paul.

Edit: Sorry the thread title should say exponential functions, too tired.