((-2 pi x i)^v besselI(v,-i 2 pi xa)-(2 pi x i)^v besselI(v,i 2 pi xa))/(-2i sin(pi v))((-2 pi x i)^v besselI(v,-i 2 pi xa)-(2 pi x i)^v besselI(v,i 2 pi xa))/(-2i sin(pi v))

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