Question

Integral of (lnx) / x ^ 2 from 1 to 2

Answer 1

I couldn't find my original post so I had to repost it :/

Answer 2

integrate by parts

Answer 3

I know that but how!?

Answer 4

choose f and dg so that the integral df g will solve easily

Answer 5

let f be lnx and dg be 1/x^2

Answer 6

df = dx/x and g= -1/x

Answer 7

\[\int\limits_{}^{}fdg = fg - \int\limits_{}^{}gdf\]

Answer 8

But I end up taking the integral of a natural log... don't i?

Answer 9

no, you end up taking the derivative of it

Answer 10

Oh you used the opposite for f and dg... ok that works