Evaluates the second derivative of the second derivative of the Ratio of First and Zeroth Order Bessel Functions.
non-negative numeric value at which to evaluate the second derivative of A1 function.
Formula (3.49) of Fisher (1993), pag. 52 is implemented.
The function uses
The value of the second 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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