Question 311918
Simplify this rational expression. 
x^-3-x/x^-2-1 
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[(1-x^4)/x^3] / [(1-x^2)/x^2]
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Invert and multiply:
[(1-x^4)/x^3] * [x^2/(1-x^2)]
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Cancel to get:
= [(1+x^2)/x]
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Cheers,
Stan H.