Hello,

On Wednesday, February 23, 2011 9:27:25 PM UTC+1, [email protected] wrote:
>
> and found non zero terms and signal about it with the help of O(x**4).
> May be, I other word, it yield real precision of assymptotic expansion.
>
This is the advantage I see in the variant suggested. However, O(x**3) for 
the cos(x) example is fine anyway. The remainder term isn't larger than 
O(x**3), and that's maybe all one is generally interested in.

Alex

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