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Normal
Normal[
expr
] converts expr to a normal expression, from a variety of special forms.
Normal[
expr
] converts a power series to a normal expression by truncating higher-order terms.
Normal[
expr
] converts RootSum objects into explicit sums involving Root objects.
When additional "data types" are introduced, Normal should be defined to convert them, when possible, to normal expressions.
See the Mathematica book: Section 1.5.9, Section 3.4.3, Section 3.6.5.
See also: SeriesCoefficient.
Further Examples
Here is a plot of the cosine function along with its 
 order polynomial approximation.
Evaluate the cell to see the graphic.
In[1]:= 
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