## Quick Calculus Question

Post any maths and/or physics related questions here.

Moderators: Darobat, RecursiveS, Dante Shamest, Bugdude, Wizard

### Quick Calculus Question

Is this correct?
Ln(e^x) = 1
and
e^ln(x) = 0
Sin

Posts: 1570
Joined: Tue Oct 07, 2003 10:16 am

No. How can x^y be 0 if x!=0 to begin with ?

ventsyv

Posts: 2810
Joined: Mon Sep 22, 2003 5:25 pm
Location: MD USA

I'm sorry I made a typo and the question was incorrect to begin with.
Sin

Posts: 1570
Joined: Tue Oct 07, 2003 10:16 am

What I meant to ask (If I was not so high when I posted the question the first time) is that if this is correct:

Code: Select all
`The derivative of e^(lnx + pi) = e^ pi`

Does the Lnx cancel out?
Sin

Posts: 1570
Joined: Tue Oct 07, 2003 10:16 am

No.

(e^(ln x + pi)) ' = (e^(ln x + pi))(1/x) = (e^(ln x + pi))/x

t i l e x

Posts: 3604
Joined: Wed Dec 03, 2003 3:59 pm

e^(ln(x) + pi) = (e^(ln(x)))(e^pi) = x*e^pi => d/dx (e^(ln(x) + pi)) = e^pi

Jimbo

Posts: 601
Joined: Thu Sep 25, 2003 6:48 pm
Location: Seattle

Jimbo wrote:e^(ln(x) + pi) = (e^(ln(x)))(e^pi) = x*e^pi => d/dx (e^(ln(x) + pi)) = e^pi

Twas what I thought.
Thanks both of you.
Sin

Posts: 1570
Joined: Tue Oct 07, 2003 10:16 am