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WSbesy() Function WSbesy ( X As  Double, Nu As  Double  ) Spherical Bessel function of the second kind yν(x) (fractional order) Purpose WSbesy computes the spherical Bessel function of the second kind yν(x). Returns Spherical Bessel function of the second kind yν(x). Parameters [in] X Argument x. (X > 0) [in] Nu Order ν.