$\"\"$

The partial sum is $\"\"$ .

The expression is $\"\"$ .

Substitute the corresponding values.

$\"\"$ .

Graph :

Graph the functions $\"\"$ , $\"\"$ and $\"\"$ .

$\"\"$

Observe the graph :

$\"\"$ .

$\"\"$

The functions are $\"\"$ , $\"\"$ and $\"\"$ .

Tabulate the values for different values of $\"\"$ .

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Observe the table :

$\"\"$ .

$\"\"$

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