$\"\"$

Fifth partial sum of power series for $\"\"$ and $\"\"$ :

The power series representing $\"\"$ and $\"\"$ are given by

$\"\"$ .

$\"\"$

The power series is $\"\"$ . \ \

$\"\"$ .

Substiute $\"\"$ .

The value of $\"\"$ .

$\"\"$ .

$\"\"$

$\"\"$ .

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The approximate value of $\"\"$ using the fifth partial sum of power series is $\"\"$ .