- #1
Matuku
- 12
- 0
Homework Statement
Find,
[tex]\int \left( \frac{1}{x} - \frac{1}{x^2} \right)e^x ~dx[/tex]
Homework Equations
None
The Attempt at a Solution
I tried integrating by parts,
[tex] \]\int \left( \frac{1}{x} - \frac{1}{x^2} \right)e^x ~dx\\
Let ~\frac{dv}{dx}=\left( \frac{1}{x} - \frac{1}{x^2} \right), and ~u=e^x.\\
\therefore v=\ln{x} + \frac{1}{x}, and ~\frac{du}{dx}=e^x\\
\therefore \int \left( \frac{1}{x} - \frac{1}{x^2} \right)e^x ~dx
= e^x(\ln{x} + \frac{1}{x}) - \int{ e^x(\ln{x} + \frac{1}{x})}~dx\[ [/tex]
But I can't see what to do now; the next integral is even messier than the first!