Legendre poynomials proof question.Help

[aligator123]

Hello everyone i had some questions about legendre polynomials. I have solved most of them but i had just two not answered question. I tried to solve this problem by rodriguez rule but it was really hard for me. Could anyone help me or give me some hints for this question?

http://img149.imageshack.us/img149/1314/mathjr1.th.jpg

 

[siddharth]

Please don't double post.
Continue your discussion in your other post.

 

[aligator123]

ok i will look for help in physics.