Computes Bessel function of x of the second kind of order 0.
#include <math.h>
double y0 ( double x);
Specifies the number whose Bessel function is to be derived.
If successful, returns the result of the desired Bessel function of the argument x.
If x is negative, sets errno to EDOM, prints a DOMAIN error message to stderr, and returns HUGE_VAL.