BesselSimplify[expr] transforms Bessel functions in expr, trying to either decrease the number of Bessel functions, or convert Bessel functions into more elementary functions.
BesselSimplify is automatically used inside FullSimplify and FunctionExpand.
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BesselSimplify[expr] transforms Bessel functions in expr, trying to either decrease the number of Bessel functions, or convert Bessel functions into more elementary functions. 
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