the answer is 0 but I don't know how to get itQuote:

Find the derivative of ln e^u/u

lim

h-> 0 square root of (25-h) -5/h

The answer is 1/10 but I once again don't know how to do it.

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- November 3rd 2008, 07:19 PMJimDavid2 derivative problemsQuote:

Find the derivative of ln e^u/u

lim

h-> 0 square root of (25-h) -5/h

The answer is 1/10 but I once again don't know how to do it. - November 3rd 2008, 07:25 PMJameson
If it's supposed to be 0 then you must mean

by log rules

y'=0 - November 3rd 2008, 07:46 PMJimDavid
- November 3rd 2008, 07:52 PMJameson
If I'm reading it right it's

Multiply the numerator and denominator by

This comes out to be

Now try the limit again. - November 3rd 2008, 08:00 PMJimDavid
- November 3rd 2008, 08:03 PMJameson
No, I'm pretty sure the answer is negative. I just checked the limit on a calculator and it confirms it's -1/10.