How do I simplify
$x^n P_n\left(\frac{y} {x} \right) $
where $P_n$ is a Legendre polynomial and
$x^2=y^2+a$?
I further want to take derivatives with respect to $y$ and $a$.
2026-03-26 20:38:33.1774557513
Simplify Legendre Polynomial times a power
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