Question about Texas Instruments TI-89 Calculator

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Derivatives? I am having trouble finding derivatives. Even when I follow the instructions in the users mannuel (pg. 52) exactly, I am getting an error message [Error: Non-algerbraic variable in expression]. I get the feeling I have messed up some kind of setting or something...any help is appreciated. Thanks

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F'(x)=x

Posted on Apr 04, 2008

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Wow thanks! Yeah, my calculator started doing this -oo (infinity) thing when I typed in an integral. Don't know what I did to set it up (or upset it, as it were) so yeah, the NewProb set me back on course. Thanks!

Posted on Dec 22, 2007

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Dude thanks for that. I was about to smash my calculator.

Posted on Sep 25, 2007

On the home screen, go to F6 ([2nd] [F1]) and then press [2] (NewProb). It should fix the problem.

Posted on Apr 24, 2007

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Posted on Jan 02, 2017

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