maths problem

Hey friends,

Thank you for your valuable suggestion this math problem site,I am currently in 3rd year doing Intermediate two maths. I am in the top set, but whenever it is exam time, and there is a problem solving question I don't understand it at all and I have no idea what to do.

Thanks
Andy Charles

Wouldn't it just be a linear combination of P0(x) through P4(x) from this site:

http://mathworld.wolfram.com/LegendrePolynomial.html

Figure out the coefficient for P4, then P3, ..., then P0.