sum (-1)^m*(2^(-2*m-1)*(b)^(2*m))/((A-z*2*m)*m!(m+1)!) from m=0 to xsum (-1)^m*(2^(-2*m-1)*(b)^(2*m))/((A-z*2*m)*m!(m+1)!) from m=0 to x

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