Function: pollegendre
Section: polynomials
C-Name: pollegendre_eval
Prototype: LDG
Help: pollegendre(n,{a='x}): legendre polynomial of degree n evaluated at a.
Description:
  (small,?var):gen    pollegendre($1,$2)
  (small,gen):gen     pollegendre_eval($1,$2)
Doc: $n^{\text{th}}$ \idx{Legendre polynomial} evaluated at $a$ (\kbd{'x} by
 default).
Variant: To obtain the $n$-th Legendre polynomial in variable $v$,
 use \fun{GEN}{pollegendre}{long n, long v}.
