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#### Spherical Neumann functions <a id="sf.cmath.sph.neumann">[[sf.cmath.sph.neumann]]</a>
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``` cpp
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double sph_neumann(unsigned n, double x);
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float sph_neumannf(unsigned n, float x);
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long double sph_neumannl(unsigned n, long double x);
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```
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*Effects:* These functions compute the spherical Neumann functions, also
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known as the spherical Bessel functions of the second kind, of their
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respective arguments `n` and `x`.
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*Returns:*
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$$\mathsf{n}_n(x) = (\pi/2x)^{1\!/\!2} \mathsf{N}_{n + 1\!/\!2}(x)
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\text{ ,\quad for $x \ge 0$,}$$ where n is `n` and x is `x`.
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*Remarks:* The effect of calling each of these functions is
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*implementation-defined* if `n >= 128`.
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See also [[sf.cmath.cyl.neumann]].
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