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thanks, but occupy "FunctionExpand" command and has not changed the function. The tabulated result of the expression I'm solving is a function bessel function so the function MeijerG restricts me 
hi, I want to know which operating system is best to use mathematica 9. Currently have installed windows 8 on my laptop, to resolve integral or minimize equations with several variables mathematica this occupies only 20-30% of the cpu. As I can do...