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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:* $$%
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\mathsf{j}_n(x) =
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(\pi/2x)^{1\!/\!2} \mathsf{J}_{n + 1\!/\!2}(x),
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\quad \mbox{for $x \ge 0$}$$ 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_bessel_j]].
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