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- Thread starter Sanosuke Sagara
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quasar987

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Like in your other question, you would like to find the x meeting the condition "x^3 is ignorable" and such that

[tex]\frac{1-x}{1+x}=\frac{19}{21}[/tex]

You will find that x easily by solving this last equation for x.

Then, with n=1/4, your polynomial formula gives you the wished approximation.

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Thanks for your help.I think I now can understand with what the question want.

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