SeriesCoefficient
 Usage
• SeriesCoefficient[series, n] 求出一个幂级数中   次项的系数. • SeriesCoefficient[series,   ,  , ...  ] 求出一个多元级数中某一项的系数.
Notes
 Further Examples
Here is the coefficient of the degree 5 term in the series for log(1 + x).
In[1]:=
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Out[1]=
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In[2]:=
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Out[2]=
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In[3]:=
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