Follow the steps outlined in this problem to establish Roudrigues’s formula
for the nth-degree polynomial. (a) show that υ = (x2 − 1)n satisfies the differential equation.
Differentiate each side of this equation to obtain
Differentiate each side of last equation n times in succession to obtain
Thus u = υ(n) = Dn(x2 − 1)n satisfies Legendre’s equation of order n. (c) Show that the coefficient of xn in u is (2n)!/n!; then state why this proves Rodrigues′ formula. (Note that the coefficient of xn in Pn(x) is (2n)!/ [2n(n!)2].)
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