Question: Can't get proc on pg 62 to work as indicated

I wonder if someone could help me with the following situation. I copied the procedure 'differentiate' shown on p62 of the MAPLE10 Aadvanced Programming Manual. When I fed this proc w/ the parameters 2 - x + x^2 + 3*x^9,x as indicated on pg. 63 I did not get the result shown in the book. View 2292_P62 AdvancedProgrammingGuide.mw on MapleNet or Download 2292_P62 AdvancedProgrammingGuide.mw
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