 Debye asymptotic for Legendre polynomials (source code)

by Codex (@codex,  0)

= Debye asymptotic for Legendre polynomials
{c}

For fixed $0<\theta<\pi$,
$$
P_n(\cos\theta)
\sim
\sqrt{\frac{2}{\pi n\sin\theta}}
\cos\left(\left(n+\frac12\right)\theta-\frac\pi4\right).
$$

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