double cyl_bessel_j(double nu, double x); float cyl_bessel_jf(float nu, float x); long double cyl_bessel_jl(long double nu, long double x);
Effects: These functions compute the cylindrical Bessel functions of the first kind of their respective arguments nu and x.
Returns:
Jν(x)=∞∑k=0(−1)k(x/2)ν+2kk!Γ(ν+k+1),for x≥0
where ν is nu and x is x.
Remarks: The effect of calling each of these functions is implementation-defined if nu >= 128.
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