PDA

View Full Version : Help me please. Integral problem

Cloe
15th May 2006, 07:15 PM
How do i integrate lnx
MathsMan
16th May 2006, 02:15 PM
How do i integrate lnx

Use integration by parts.
let u = ln x
and dv/dx = 1

∫ln x dx = x(ln x) - ∫x(2/x) dx
= xln x - ∫(2) dx
= xln x - 2x +c
Cloe
16th May 2006, 04:07 PM
Thanx mathsman. I forgt u had to put a 1 in front of the log.
:)