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Maclaurin series for ArcCosh[x]


Try:

Series[ArcCosh[x], {x, 0, 11}]

and now try

ArcCosh[x] + O[x]^12

At least with my version of Mathematica:

$Version
5.2 for Mac OS X (February 24, 2006)


I do not get the same answer (in fact in the latter case the input is  
returned unevaluated). With ArcSinh and any other function that I  
have tried in place of ArcCosh  the outputs are always the same.

Andrzej Kozlowski





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