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How to substitute this math expression?

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tyanata

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May be my question is idiotic, but can you advise me how to substitute this expression
1/(1+A*X+B+C*((X)^2)). Is there some solution simailar as 1/(1+A*X)≈1*(1-A*X).
If you now some thing like this. Please help!!!!
 

mayyan

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Re: Substitution help

Make B and X small and then u can neglect B and CX^2
 

Hin1219

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Substitution help

What do you mean? Whats the full question?
 

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