5.4.11. Bessel functions of the first kind (j0, j1, jn)

double j0(double x);
double j1(double x);
double jn(int n, double x);

These functions compute Bessel functions of the first kind. j0 and j1 compute the functions of order 0 and 1 respectively. jn computes the function of order n.

If the absolute value of x exceeds p times 252, these functions return an ERANGE error, denoting total loss of significance in the result.

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