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Series[] command


Hi all,

I need to obtain the second-order Taylor series expansion of a*b around the
points ma and mb. I thought Mathematica's Series[] command would do the
trick, but no. The correct answer is:

ma*mb + ma(b-mb) + mb(a-ma) + (a-ma)(b-mb)

Mathematica gives:

b(a-ma) + ma(b-mb) + ma*mb

Whaddup??

Thanks,
Kris Preacher
UNC



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