Evaluates the first derivative of the Ratio of First and Zeroth Order Bessel Functions
non-negative numeric value at which to evaluate the first derivative of A1 function.
The formula (3.48) of Fisher (1993), pag. 52 is implemented.
The function uses
The value of the first derivative of A1 function in the point
Claudio Agostinelli and Alessandro Gagliardi.
N.I. Fisher (1993) Statistical Analysis of Circular Data, Cambridge University Press.
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