- #1

shaun_chou

- 13

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## Homework Statement

In solving a question I got a problem of solving the following integral. Your comments are appreciated.

## Homework Equations

[tex]\int_{-1}^{1}xP_l'(x)dx=?[/tex]

## The Attempt at a Solution

I tried to solve by integration by parts, i.e.

[tex]\left{}xP_l(x)\right{|}_{-1}^{1}-\int_{-1}^{1}P_l(x)[/tex] but I can't get the simple solution to [tex]\int_{-1}^{1}P_l(x)[/tex]