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#### Spherical Bessel functions of the first kind <a id="sf.cmath.sph.bessel">[[sf.cmath.sph.bessel]]</a>
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``` cpp
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double sph_bessel(unsigned n, double x);
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float sph_besself(unsigned n, float x);
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long double sph_bessell(unsigned n, long double x);
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```
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*Effects:* These functions compute the spherical Bessel functions of the
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first kind of their respective arguments `n` and `x`.
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*Returns:*
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$$\mathsf{j}_n(x) = (\pi/2x)^{1\!/\!2} \mathsf{J}_{n + 1\!/\!2}(x) \text{ ,\quad for $x \ge 0$,}$$
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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.bessel.j]].
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