From: ivgroups@onlinehome.de   
      
   "IV" wrote in news:lvca72$689$1@online.de...   
      
   I need the following expression without phi(x):   
   cos(phi(x))/x - sin(phi(x))/(x^2).   
   phi is the inverse function of the cardinal sine function sinc, sinc(x) =   
   sin(x)/x, sinc(phi(x)) = phi(sinc(x)) = x.   
   All be in the Real numbers or in the complex numbers.   
   Don't consider the domains of the functions.   
      
   Has somebody here a solution?   
      
   Thank you.   
      
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