Hi

I am programming a problem for which I have to evaluate an expression of the form:

(R/g)J1(Rg) where J1(x) is a Bessel function.

I have to evaluate it at a range of "g" values including g = 0 which I believe gives me case of "0/0" as J1(0) = 0.

For other function where this occurs I have used L'Hopital but I don't know what to do for this case as I don't know how to differentiate the Bessel function.

Any help would be very much appreciated.