- #1
FallingMan
- 31
- 0
Homework Statement
[tex]\int_4^5 \frac{dx}{(3x)(ln(x))(ln^3(ln(x)))} \,[/tex]
Homework Equations
I'll probably need to use u-substitution as well as integration by parts for this problem.
The Attempt at a Solution
[tex]\int_4^5 \frac{dx}{(3x)(ln(x))(ln^3(ln(x)))} \,[/tex]
1. Factor out 1/3 for convenience.
[tex]\frac{1}{3}\, \int_4^5 \frac{dx}{(x)(ln(x))(ln^3(ln(x)))} \,[/tex]
2. Let u = ln(x), du = 1/x * dx, thus dx = du * x
[tex]\frac{1}{3}\, \int_4^5 \frac{(x)(du)}{(x)(u)(ln^3(u))} \, = \frac{1}{3}\, \int_4^5 \frac{du}{(u)(ln^3(u))} \,[/tex]
From integration by parts we know that ∫g*dv = g*v - ∫dg*v
I'm stuck here with regards to what to assign as g and what to assign as dv.
I could make:
g = 1/u
dg = -1/u^2
dv = 1/ln^3(u) * du
v = ?
I'm not sure how to integrate dv to get to v to make the integration by parts work.
Any help would be appreciated.