Calculators Calculating Derivative of 1/(1-x) With a Ti89 Error?

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    Derivative Error
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Either I'm lost, or my Ti89 has an error in it's CAS (which is unbelievable). What is the derivative of 1/(1-x) ?
 
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\frac 1 {(1-x)^2}

What does your calculator say it is?
 
Nevermind, i got it.
 
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