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Question: sometimes it works, sometimes not

Question:sometimes it works, sometimes not

phil76600 30 Maple
plot
June 28 2013
1

hi,look at that. I obtain a curve. But when i do it again

this message appear : Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct

when i make plot (the same command)

??????????

Have u got an idea of such a problem

Thanks for answer
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