code: def j1_2(a=1):
      r
  
      def lhs(x):
          return np.exp(-a*x)
  
      def rhs(b):
          return (np.sqrt(b**2 + a**2) - a)/(b*np.sqrt(b**2 + a**2))
  
      return Ghosh('j1', lhs, rhs)
docs: r"""Hankel transform pair J1_2 ([Ande75]_).