integral (1 Viewer)

[ressul]

How to do the integral: lnx?

 

[mojako]

by parts..
let u = lnx
let dv/dx = 1

 

[withoutaface]

let u=lnx
xdu=dx

/
|ue^udu
/

ue^u-int(e^u)
xlnx-x+c

 

[gordo]

y = lnx . d/dx (x)
= xlnx - int(x.1/x)
=xlnx - x +c

 

[mojako]

so we have three methods?
the one by withoutaface seems to be most elegant
; )
whoops.. its edited <== hidden treasure

 

[Veck]

my vote goes to Gordo

 

[gabn]

they all wrote the same thing but gordo's is the easiest to follow

 

[gordo]

let u=lnx
xdu=dx

/
|ue^udu
/

ue^u-int(e^u)
xlnx-x+c

lol, i saw that edit

 

[mojako]

they all wrote the same thing but gordo's is the easiest to follow

so u mean mine isnt easy to follow??

 

[withoutaface]

lol, i saw that edit

You didn't quote me, you can't prove anything

 

[mojako]

let u=lnx
xdu=dx

/
|e^udu
/

e^u+c
x+c

I did, hehehe..

 

[withoutaface]

You know too much

*shifty eyes